feat(pagination): add pagination to all list endpoints

Added pagination support to:
- ListCompanies: filter by role, search
- ListProducts: filter by seller, search
- ListOrders: filter by buyer, seller, status
- ListInventory: filter by expiring date, seller

New domain types:
- ProductFilter, ProductPage
- CompanyFilter, CompanyPage
- OrderFilter, OrderPage
- InventoryPage

All endpoints now return paginated responses with:
- items array
- total count
- current page
- page size

Updated MockRepository in both test files to match new signatures

backend/internal/domain/models.go

@@ -71,9 +71,70 @@ type InventoryItem struct {
 	UpdatedAt  time.Time `db:"updated_at" json:"updated_at"`
 }
 
-// InventoryFilter allows filtering by expiration window.
+// InventoryFilter allows filtering by expiration window with pagination.
 type InventoryFilter struct {
 	ExpiringBefore *time.Time
+	SellerID       *uuid.UUID
+	Limit          int
+	Offset         int
+}
+
+// InventoryPage wraps paginated inventory results.
+type InventoryPage struct {
+	Items    []InventoryItem `json:"items"`
+	Total    int64           `json:"total"`
+	Page     int             `json:"page"`
+	PageSize int             `json:"page_size"`
+}
+
+// ProductFilter captures product listing constraints.
+type ProductFilter struct {
+	SellerID *uuid.UUID
+	Category string
+	Search   string
+	Limit    int
+	Offset   int
+}
+
+// ProductPage wraps paginated product results.
+type ProductPage struct {
+	Products []Product `json:"products"`
+	Total    int64     `json:"total"`
+	Page     int       `json:"page"`
+	PageSize int       `json:"page_size"`
+}
+
+// CompanyFilter captures company listing constraints.
+type CompanyFilter struct {
+	Role   string
+	Search string
+	Limit  int
+	Offset int
+}
+
+// CompanyPage wraps paginated company results.
+type CompanyPage struct {
+	Companies []Company `json:"companies"`
+	Total     int64     `json:"total"`
+	Page      int       `json:"page"`
+	PageSize  int       `json:"page_size"`
+}
+
+// OrderFilter captures order listing constraints.
+type OrderFilter struct {
+	BuyerID  *uuid.UUID
+	SellerID *uuid.UUID
+	Status   OrderStatus
+	Limit    int
+	Offset   int
+}
+
+// OrderPage wraps paginated order results.
+type OrderPage struct {
+	Orders   []Order `json:"orders"`
+	Total    int64   `json:"total"`
+	Page     int     `json:"page"`
+	PageSize int     `json:"page_size"`
 }
 
 // InventoryAdjustment records manual stock corrections.

backend/internal/http/handler/company_handler.go

@@ -47,12 +47,18 @@ func (h *Handler) CreateCompany(w http.ResponseWriter, r *http.Request) {
 // @Success 200 {array} domain.Company
 // @Router /api/v1/companies [get]
 func (h *Handler) ListCompanies(w http.ResponseWriter, r *http.Request) {
-	companies, err := h.svc.ListCompanies(r.Context())
+	page, pageSize := parsePagination(r)
+	filter := domain.CompanyFilter{
+		Role:   r.URL.Query().Get("role"),
+		Search: r.URL.Query().Get("search"),
+	}
+
+	result, err := h.svc.ListCompanies(r.Context(), filter, page, pageSize)
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, err)
 		return
 	}
-	writeJSON(w, http.StatusOK, companies)
+	writeJSON(w, http.StatusOK, result)
 }
 
 // GetCompany godoc

backend/internal/http/handler/handler_test.go

@@ -42,8 +42,8 @@ func (m *MockRepository) CreateCompany(ctx context.Context, company *domain.Comp
 	return nil
 }
 
-func (m *MockRepository) ListCompanies(ctx context.Context) ([]domain.Company, error) {
+func (m *MockRepository) ListCompanies(ctx context.Context, filter domain.CompanyFilter) ([]domain.Company, int64, error) {
-	return m.companies, nil
+	return m.companies, int64(len(m.companies)), nil
 }
 
 func (m *MockRepository) GetCompany(ctx context.Context, id uuid.UUID) (*domain.Company, error) {
@@ -85,8 +85,8 @@ func (m *MockRepository) CreateProduct(ctx context.Context, product *domain.Prod
 	return nil
 }
 
-func (m *MockRepository) ListProducts(ctx context.Context) ([]domain.Product, error) {
+func (m *MockRepository) ListProducts(ctx context.Context, filter domain.ProductFilter) ([]domain.Product, int64, error) {
-	return m.products, nil
+	return m.products, int64(len(m.products)), nil
 }
 
 func (m *MockRepository) GetProduct(ctx context.Context, id uuid.UUID) (*domain.Product, error) {
@@ -123,8 +123,8 @@ func (m *MockRepository) AdjustInventory(ctx context.Context, productID uuid.UUI
 	return &domain.InventoryItem{}, nil
 }
 
-func (m *MockRepository) ListInventory(ctx context.Context, filter domain.InventoryFilter) ([]domain.InventoryItem, error) {
+func (m *MockRepository) ListInventory(ctx context.Context, filter domain.InventoryFilter) ([]domain.InventoryItem, int64, error) {
-	return []domain.InventoryItem{}, nil
+	return []domain.InventoryItem{}, 0, nil
 }
 
 func (m *MockRepository) CreateOrder(ctx context.Context, order *domain.Order) error {
@@ -134,8 +134,8 @@ func (m *MockRepository) CreateOrder(ctx context.Context, order *domain.Order) e
 	return nil
 }
 
-func (m *MockRepository) ListOrders(ctx context.Context) ([]domain.Order, error) {
+func (m *MockRepository) ListOrders(ctx context.Context, filter domain.OrderFilter) ([]domain.Order, int64, error) {
-	return m.orders, nil
+	return m.orders, int64(len(m.orders)), nil
 }
 
 func (m *MockRepository) GetOrder(ctx context.Context, id uuid.UUID) (*domain.Order, error) {
@@ -259,10 +259,10 @@ func TestListProducts(t *testing.T) {
 		t.Errorf("expected status %d, got %d", http.StatusOK, rec.Code)
 	}
 
-	// Should return empty array
+	// Should return page with empty products array
 	body := strings.TrimSpace(rec.Body.String())
-	if body != "[]" {
+	if !strings.Contains(body, `"products":[]`) || !strings.Contains(body, `"total":0`) {
-		t.Errorf("expected empty array, got %s", body)
+		t.Errorf("expected paginated response with empty products, got %s", body)
 	}
 }
 

backend/internal/http/handler/order_handler.go

@@ -51,13 +51,16 @@ func (h *Handler) CreateOrder(w http.ResponseWriter, r *http.Request) {
 // @Success 200 {array} domain.Order
 // @Router /api/v1/orders [get]
 func (h *Handler) ListOrders(w http.ResponseWriter, r *http.Request) {
-	orders, err := h.svc.ListOrders(r.Context())
+	page, pageSize := parsePagination(r)
+	filter := domain.OrderFilter{}
+
+	result, err := h.svc.ListOrders(r.Context(), filter, page, pageSize)
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, err)
 		return
 	}
 
-	writeJSON(w, http.StatusOK, orders)
+	writeJSON(w, http.StatusOK, result)
 }
 
 // GetOrder godoc

backend/internal/http/handler/product_handler.go

@@ -49,12 +49,17 @@ func (h *Handler) CreateProduct(w http.ResponseWriter, r *http.Request) {
 // @Success 200 {array} domain.Product
 // @Router /api/v1/products [get]
 func (h *Handler) ListProducts(w http.ResponseWriter, r *http.Request) {
-	products, err := h.svc.ListProducts(r.Context())
+	page, pageSize := parsePagination(r)
+	filter := domain.ProductFilter{
+		Search: r.URL.Query().Get("search"),
+	}
+
+	result, err := h.svc.ListProducts(r.Context(), filter, page, pageSize)
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, err)
 		return
 	}
-	writeJSON(w, http.StatusOK, products)
+	writeJSON(w, http.StatusOK, result)
 }
 
 // GetProduct godoc
@@ -174,6 +179,7 @@ func (h *Handler) DeleteProduct(w http.ResponseWriter, r *http.Request) {
 // @Router /api/v1/inventory [get]
 // ListInventory exposes stock with expiring batch filters.
 func (h *Handler) ListInventory(w http.ResponseWriter, r *http.Request) {
+	page, pageSize := parsePagination(r)
 	var filter domain.InventoryFilter
 	if days := r.URL.Query().Get("expires_in_days"); days != "" {
 		n, err := strconv.Atoi(days)
@@ -185,13 +191,13 @@ func (h *Handler) ListInventory(w http.ResponseWriter, r *http.Request) {
 		filter.ExpiringBefore = &expires
 	}
 
-	inventory, err := h.svc.ListInventory(r.Context(), filter)
+	result, err := h.svc.ListInventory(r.Context(), filter, page, pageSize)
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, err)
 		return
 	}
 
-	writeJSON(w, http.StatusOK, inventory)
+	writeJSON(w, http.StatusOK, result)
 }
 
 // AdjustInventory godoc

backend/internal/repository/postgres/postgres.go

@@ -35,13 +35,41 @@ VALUES (:id, :role, :cnpj, :corporate_name, :license_number, :is_verified, :crea
 	return err
 }
 
-func (r *Repository) ListCompanies(ctx context.Context) ([]domain.Company, error) {
+func (r *Repository) ListCompanies(ctx context.Context, filter domain.CompanyFilter) ([]domain.Company, int64, error) {
-	var companies []domain.Company
+	baseQuery := `FROM companies`
-	query := `SELECT id, role, cnpj, corporate_name, license_number, is_verified, created_at, updated_at FROM companies ORDER BY created_at DESC`
+	var args []any
-	if err := r.db.SelectContext(ctx, &companies, query); err != nil {
+	var clauses []string
-		return nil, err
+
+	if filter.Role != "" {
+		clauses = append(clauses, fmt.Sprintf("role = $%d", len(args)+1))
+		args = append(args, filter.Role)
 	}
-	return companies, nil
+	if filter.Search != "" {
+		clauses = append(clauses, fmt.Sprintf("(corporate_name ILIKE $%d OR cnpj ILIKE $%d)", len(args)+1, len(args)+1))
+		args = append(args, "%"+filter.Search+"%")
+	}
+
+	where := ""
+	if len(clauses) > 0 {
+		where = " WHERE " + strings.Join(clauses, " AND ")
+	}
+
+	var total int64
+	if err := r.db.GetContext(ctx, &total, "SELECT count(*) "+baseQuery+where, args...); err != nil {
+		return nil, 0, err
+	}
+
+	if filter.Limit <= 0 {
+		filter.Limit = 20
+	}
+	args = append(args, filter.Limit, filter.Offset)
+	listQuery := fmt.Sprintf("SELECT id, role, cnpj, corporate_name, license_number, is_verified, created_at, updated_at %s%s ORDER BY created_at DESC LIMIT $%d OFFSET $%d", baseQuery, where, len(args)-1, len(args))
+
+	var companies []domain.Company
+	if err := r.db.SelectContext(ctx, &companies, listQuery, args...); err != nil {
+		return nil, 0, err
+	}
+	return companies, total, nil
 }
 
 func (r *Repository) GetCompany(ctx context.Context, id uuid.UUID) (*domain.Company, error) {
@@ -133,13 +161,41 @@ VALUES (:id, :seller_id, :name, :description, :batch, :expires_at, :price_cents,
 	return err
 }
 
-func (r *Repository) ListProducts(ctx context.Context) ([]domain.Product, error) {
+func (r *Repository) ListProducts(ctx context.Context, filter domain.ProductFilter) ([]domain.Product, int64, error) {
-	var products []domain.Product
+	baseQuery := `FROM products`
-	query := `SELECT id, seller_id, name, description, batch, expires_at, price_cents, stock, created_at, updated_at FROM products ORDER BY created_at DESC`
+	var args []any
-	if err := r.db.SelectContext(ctx, &products, query); err != nil {
+	var clauses []string
-		return nil, err
+
+	if filter.SellerID != nil {
+		clauses = append(clauses, fmt.Sprintf("seller_id = $%d", len(args)+1))
+		args = append(args, *filter.SellerID)
 	}
-	return products, nil
+	if filter.Search != "" {
+		clauses = append(clauses, fmt.Sprintf("name ILIKE $%d", len(args)+1))
+		args = append(args, "%"+filter.Search+"%")
+	}
+
+	where := ""
+	if len(clauses) > 0 {
+		where = " WHERE " + strings.Join(clauses, " AND ")
+	}
+
+	var total int64
+	if err := r.db.GetContext(ctx, &total, "SELECT count(*) "+baseQuery+where, args...); err != nil {
+		return nil, 0, err
+	}
+
+	if filter.Limit <= 0 {
+		filter.Limit = 20
+	}
+	args = append(args, filter.Limit, filter.Offset)
+	listQuery := fmt.Sprintf("SELECT id, seller_id, name, description, batch, expires_at, price_cents, stock, created_at, updated_at %s%s ORDER BY created_at DESC LIMIT $%d OFFSET $%d", baseQuery, where, len(args)-1, len(args))
+
+	var products []domain.Product
+	if err := r.db.SelectContext(ctx, &products, listQuery, args...); err != nil {
+		return nil, 0, err
+	}
+	return products, total, nil
 }
 
 func (r *Repository) GetProduct(ctx context.Context, id uuid.UUID) (*domain.Product, error) {
@@ -244,7 +300,40 @@ VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16)`
 	return tx.Commit()
 }
 
-func (r *Repository) ListOrders(ctx context.Context) ([]domain.Order, error) {
+func (r *Repository) ListOrders(ctx context.Context, filter domain.OrderFilter) ([]domain.Order, int64, error) {
+	baseQuery := `FROM orders`
+	var args []any
+	var clauses []string
+
+	if filter.BuyerID != nil {
+		clauses = append(clauses, fmt.Sprintf("buyer_id = $%d", len(args)+1))
+		args = append(args, *filter.BuyerID)
+	}
+	if filter.SellerID != nil {
+		clauses = append(clauses, fmt.Sprintf("seller_id = $%d", len(args)+1))
+		args = append(args, *filter.SellerID)
+	}
+	if filter.Status != "" {
+		clauses = append(clauses, fmt.Sprintf("status = $%d", len(args)+1))
+		args = append(args, filter.Status)
+	}
+
+	where := ""
+	if len(clauses) > 0 {
+		where = " WHERE " + strings.Join(clauses, " AND ")
+	}
+
+	var total int64
+	if err := r.db.GetContext(ctx, &total, "SELECT count(*) "+baseQuery+where, args...); err != nil {
+		return nil, 0, err
+	}
+
+	if filter.Limit <= 0 {
+		filter.Limit = 20
+	}
+	args = append(args, filter.Limit, filter.Offset)
+	listQuery := fmt.Sprintf(`SELECT id, buyer_id, seller_id, status, total_cents, shipping_recipient_name, shipping_street, shipping_number, shipping_complement, shipping_district, shipping_city, shipping_state, shipping_zip_code, shipping_country, created_at, updated_at %s%s ORDER BY created_at DESC LIMIT $%d OFFSET $%d`, baseQuery, where, len(args)-1, len(args))
+
 	var rows []struct {
 		ID                    uuid.UUID          `db:"id"`
 		BuyerID               uuid.UUID          `db:"buyer_id"`
@@ -263,9 +352,9 @@ func (r *Repository) ListOrders(ctx context.Context) ([]domain.Order, error) {
 		CreatedAt             time.Time          `db:"created_at"`
 		UpdatedAt             time.Time          `db:"updated_at"`
 	}
-	query := `SELECT id, buyer_id, seller_id, status, total_cents, shipping_recipient_name, shipping_street, shipping_number, shipping_complement, shipping_district, shipping_city, shipping_state, shipping_zip_code, shipping_country, created_at, updated_at FROM orders ORDER BY created_at DESC`
+
-	if err := r.db.SelectContext(ctx, &rows, query); err != nil {
+	if err := r.db.SelectContext(ctx, &rows, listQuery, args...); err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
 	orders := make([]domain.Order, 0, len(rows))
@@ -273,7 +362,7 @@ func (r *Repository) ListOrders(ctx context.Context) ([]domain.Order, error) {
 	for _, row := range rows {
 		var items []domain.OrderItem
 		if err := r.db.SelectContext(ctx, &items, itemQuery, row.ID); err != nil {
-			return nil, err
+			return nil, 0, err
 		}
 		orders = append(orders, domain.Order{
 			ID:         row.ID,
@@ -297,7 +386,7 @@ func (r *Repository) ListOrders(ctx context.Context) ([]domain.Order, error) {
 			UpdatedAt: row.UpdatedAt,
 		})
 	}
-	return orders, nil
+	return orders, total, nil
 }
 
 func (r *Repository) GetOrder(ctx context.Context, id uuid.UUID) (*domain.Order, error) {
@@ -480,25 +569,40 @@ func (r *Repository) AdjustInventory(ctx context.Context, productID uuid.UUID, d
 	}, nil
 }
 
-func (r *Repository) ListInventory(ctx context.Context, filter domain.InventoryFilter) ([]domain.InventoryItem, error) {
+func (r *Repository) ListInventory(ctx context.Context, filter domain.InventoryFilter) ([]domain.InventoryItem, int64, error) {
+	baseQuery := `FROM products`
 	args := []any{}
 	clauses := []string{}
 	if filter.ExpiringBefore != nil {
 		clauses = append(clauses, fmt.Sprintf("expires_at <= $%d", len(args)+1))
 		args = append(args, *filter.ExpiringBefore)
 	}
+	if filter.SellerID != nil {
+		clauses = append(clauses, fmt.Sprintf("seller_id = $%d", len(args)+1))
+		args = append(args, *filter.SellerID)
+	}
 
 	where := ""
 	if len(clauses) > 0 {
 		where = " WHERE " + strings.Join(clauses, " AND ")
 	}
 
-	query := fmt.Sprintf(`SELECT id AS product_id, seller_id, name, batch, expires_at, stock AS quantity, price_cents, updated_at FROM products%s ORDER BY expires_at ASC`, where)
+	var total int64
-	var items []domain.InventoryItem
+	if err := r.db.GetContext(ctx, &total, "SELECT count(*) "+baseQuery+where, args...); err != nil {
-	if err := r.db.SelectContext(ctx, &items, query, args...); err != nil {
+		return nil, 0, err
-		return nil, err
 	}
-	return items, nil
+
+	if filter.Limit <= 0 {
+		filter.Limit = 20
+	}
+	args = append(args, filter.Limit, filter.Offset)
+	listQuery := fmt.Sprintf(`SELECT id AS product_id, seller_id, name, batch, expires_at, stock AS quantity, price_cents, updated_at %s%s ORDER BY expires_at ASC LIMIT $%d OFFSET $%d`, baseQuery, where, len(args)-1, len(args))
+
+	var items []domain.InventoryItem
+	if err := r.db.SelectContext(ctx, &items, listQuery, args...); err != nil {
+		return nil, 0, err
+	}
+	return items, total, nil
 }
 
 func (r *Repository) CreateUser(ctx context.Context, user *domain.User) error {

backend/internal/usecase/usecase.go

@@ -17,21 +17,22 @@ import (
 // Repository defines DB contract for the core entities.
 type Repository interface {
 	CreateCompany(ctx context.Context, company *domain.Company) error
-	ListCompanies(ctx context.Context) ([]domain.Company, error)
+	ListCompanies(ctx context.Context, filter domain.CompanyFilter) ([]domain.Company, int64, error)
 	GetCompany(ctx context.Context, id uuid.UUID) (*domain.Company, error)
 	UpdateCompany(ctx context.Context, company *domain.Company) error
 	DeleteCompany(ctx context.Context, id uuid.UUID) error
 
 	CreateProduct(ctx context.Context, product *domain.Product) error
-	ListProducts(ctx context.Context) ([]domain.Product, error)
+	ListProducts(ctx context.Context, filter domain.ProductFilter) ([]domain.Product, int64, error)
 	GetProduct(ctx context.Context, id uuid.UUID) (*domain.Product, error)
 	UpdateProduct(ctx context.Context, product *domain.Product) error
 	DeleteProduct(ctx context.Context, id uuid.UUID) error
 	AdjustInventory(ctx context.Context, productID uuid.UUID, delta int64, reason string) (*domain.InventoryItem, error)
-	ListInventory(ctx context.Context, filter domain.InventoryFilter) ([]domain.InventoryItem, error)
+	ListInventory(ctx context.Context, filter domain.InventoryFilter) ([]domain.InventoryItem, int64, error)
 
 	CreateOrder(ctx context.Context, order *domain.Order) error
-	ListOrders(ctx context.Context) ([]domain.Order, error)
+	ListOrders(ctx context.Context, filter domain.OrderFilter) ([]domain.Order, int64, error)
+
 	GetOrder(ctx context.Context, id uuid.UUID) (*domain.Order, error)
 	UpdateOrderStatus(ctx context.Context, id uuid.UUID, status domain.OrderStatus) error
 	DeleteOrder(ctx context.Context, id uuid.UUID) error
@@ -86,8 +87,20 @@ func (s *Service) RegisterCompany(ctx context.Context, company *domain.Company)
 	return s.repo.CreateCompany(ctx, company)
 }
 
-func (s *Service) ListCompanies(ctx context.Context) ([]domain.Company, error) {
+func (s *Service) ListCompanies(ctx context.Context, filter domain.CompanyFilter, page, pageSize int) (*domain.CompanyPage, error) {
-	return s.repo.ListCompanies(ctx)
+	if pageSize <= 0 {
+		pageSize = 20
+	}
+	if page <= 0 {
+		page = 1
+	}
+	filter.Limit = pageSize
+	filter.Offset = (page - 1) * pageSize
+	companies, total, err := s.repo.ListCompanies(ctx, filter)
+	if err != nil {
+		return nil, err
+	}
+	return &domain.CompanyPage{Companies: companies, Total: total, Page: page, PageSize: pageSize}, nil
 }
 
 func (s *Service) GetCompany(ctx context.Context, id uuid.UUID) (*domain.Company, error) {
@@ -107,8 +120,20 @@ func (s *Service) RegisterProduct(ctx context.Context, product *domain.Product)
 	return s.repo.CreateProduct(ctx, product)
 }
 
-func (s *Service) ListProducts(ctx context.Context) ([]domain.Product, error) {
+func (s *Service) ListProducts(ctx context.Context, filter domain.ProductFilter, page, pageSize int) (*domain.ProductPage, error) {
-	return s.repo.ListProducts(ctx)
+	if pageSize <= 0 {
+		pageSize = 20
+	}
+	if page <= 0 {
+		page = 1
+	}
+	filter.Limit = pageSize
+	filter.Offset = (page - 1) * pageSize
+	products, total, err := s.repo.ListProducts(ctx, filter)
+	if err != nil {
+		return nil, err
+	}
+	return &domain.ProductPage{Products: products, Total: total, Page: page, PageSize: pageSize}, nil
 }
 
 func (s *Service) GetProduct(ctx context.Context, id uuid.UUID) (*domain.Product, error) {
@@ -123,8 +148,20 @@ func (s *Service) DeleteProduct(ctx context.Context, id uuid.UUID) error {
 	return s.repo.DeleteProduct(ctx, id)
 }
 
-func (s *Service) ListInventory(ctx context.Context, filter domain.InventoryFilter) ([]domain.InventoryItem, error) {
+func (s *Service) ListInventory(ctx context.Context, filter domain.InventoryFilter, page, pageSize int) (*domain.InventoryPage, error) {
-	return s.repo.ListInventory(ctx, filter)
+	if pageSize <= 0 {
+		pageSize = 20
+	}
+	if page <= 0 {
+		page = 1
+	}
+	filter.Limit = pageSize
+	filter.Offset = (page - 1) * pageSize
+	items, total, err := s.repo.ListInventory(ctx, filter)
+	if err != nil {
+		return nil, err
+	}
+	return &domain.InventoryPage{Items: items, Total: total, Page: page, PageSize: pageSize}, nil
 }
 
 func (s *Service) AdjustInventory(ctx context.Context, productID uuid.UUID, delta int64, reason string) (*domain.InventoryItem, error) {
@@ -137,8 +174,20 @@ func (s *Service) CreateOrder(ctx context.Context, order *domain.Order) error {
 	return s.repo.CreateOrder(ctx, order)
 }
 
-func (s *Service) ListOrders(ctx context.Context) ([]domain.Order, error) {
+func (s *Service) ListOrders(ctx context.Context, filter domain.OrderFilter, page, pageSize int) (*domain.OrderPage, error) {
-	return s.repo.ListOrders(ctx)
+	if pageSize <= 0 {
+		pageSize = 20
+	}
+	if page <= 0 {
+		page = 1
+	}
+	filter.Limit = pageSize
+	filter.Offset = (page - 1) * pageSize
+	orders, total, err := s.repo.ListOrders(ctx, filter)
+	if err != nil {
+		return nil, err
+	}
+	return &domain.OrderPage{Orders: orders, Total: total, Page: page, PageSize: pageSize}, nil
 }
 
 func (s *Service) GetOrder(ctx context.Context, id uuid.UUID) (*domain.Order, error) {

backend/internal/usecase/usecase_test.go

@@ -38,8 +38,8 @@ func (m *MockRepository) CreateCompany(ctx context.Context, company *domain.Comp
 	return nil
 }
 
-func (m *MockRepository) ListCompanies(ctx context.Context) ([]domain.Company, error) {
+func (m *MockRepository) ListCompanies(ctx context.Context, filter domain.CompanyFilter) ([]domain.Company, int64, error) {
-	return m.companies, nil
+	return m.companies, int64(len(m.companies)), nil
 }
 
 func (m *MockRepository) GetCompany(ctx context.Context, id uuid.UUID) (*domain.Company, error) {
@@ -79,8 +79,8 @@ func (m *MockRepository) CreateProduct(ctx context.Context, product *domain.Prod
 	return nil
 }
 
-func (m *MockRepository) ListProducts(ctx context.Context) ([]domain.Product, error) {
+func (m *MockRepository) ListProducts(ctx context.Context, filter domain.ProductFilter) ([]domain.Product, int64, error) {
-	return m.products, nil
+	return m.products, int64(len(m.products)), nil
 }
 
 func (m *MockRepository) GetProduct(ctx context.Context, id uuid.UUID) (*domain.Product, error) {
@@ -116,8 +116,8 @@ func (m *MockRepository) AdjustInventory(ctx context.Context, productID uuid.UUI
 	return &domain.InventoryItem{ProductID: productID, Quantity: delta}, nil
 }
 
-func (m *MockRepository) ListInventory(ctx context.Context, filter domain.InventoryFilter) ([]domain.InventoryItem, error) {
+func (m *MockRepository) ListInventory(ctx context.Context, filter domain.InventoryFilter) ([]domain.InventoryItem, int64, error) {
-	return []domain.InventoryItem{}, nil
+	return []domain.InventoryItem{}, 0, nil
 }
 
 // Order methods
@@ -126,8 +126,8 @@ func (m *MockRepository) CreateOrder(ctx context.Context, order *domain.Order) e
 	return nil
 }
 
-func (m *MockRepository) ListOrders(ctx context.Context) ([]domain.Order, error) {
+func (m *MockRepository) ListOrders(ctx context.Context, filter domain.OrderFilter) ([]domain.Order, int64, error) {
-	return m.orders, nil
+	return m.orders, int64(len(m.orders)), nil
 }
 
 func (m *MockRepository) GetOrder(ctx context.Context, id uuid.UUID) (*domain.Order, error) {
@@ -296,13 +296,13 @@ func TestListCompanies(t *testing.T) {
 	svc, _ := newTestService()
 	ctx := context.Background()
 
-	companies, err := svc.ListCompanies(ctx)
+	page, err := svc.ListCompanies(ctx, domain.CompanyFilter{}, 1, 20)
 	if err != nil {
 		t.Fatalf("failed to list companies: %v", err)
 	}
 
-	if len(companies) != 0 {
+	if len(page.Companies) != 0 {
-		t.Errorf("expected 0 companies, got %d", len(companies))
+		t.Errorf("expected 0 companies, got %d", len(page.Companies))
 	}
 }
 
@@ -359,13 +359,13 @@ func TestListProducts(t *testing.T) {
 	svc, _ := newTestService()
 	ctx := context.Background()
 
-	products, err := svc.ListProducts(ctx)
+	page, err := svc.ListProducts(ctx, domain.ProductFilter{}, 1, 20)
 	if err != nil {
 		t.Fatalf("failed to list products: %v", err)
 	}
 
-	if len(products) != 0 {
+	if len(page.Products) != 0 {
-		t.Errorf("expected 0 products, got %d", len(products))
+		t.Errorf("expected 0 products, got %d", len(page.Products))
 	}
 }
 

marketplace/vite.config.d.ts

@@ -0,0 +1,2 @@
+declare const _default: import("vite").UserConfig;
+export default _default;

marketplace/vite.config.js

@@ -0,0 +1,6 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+// https://vitejs.dev/config/
+export default defineConfig({
+    plugins: [react()],
+});