feat(marketplace): enable ProductSearch page for pharmacy owners and employees

- Add ProductSearch route at /search with access for owner, seller, employee roles
- Add 'Comprar Medicamentos' button to SellerDashboard header
- Add 'Comprar Medicamentos' button and card to EmployeeDashboard
- Remove redirect that was blocking access to the product search page

marketplace/src/App.tsx

@@ -9,6 +9,7 @@ import { SellerDashboardPage } from './pages/SellerDashboard'
 import { EmployeeDashboardPage } from './pages/EmployeeDashboard'
 import { DeliveryDashboardPage } from './pages/DeliveryDashboard'
 import { MyProfilePage } from './pages/MyProfile'
+import ProductSearch from './pages/ProductSearch'
 import { ProtectedRoute } from './components/ProtectedRoute'
 import { DashboardLayout } from './layouts/DashboardLayout'
 import {
@@ -143,7 +144,15 @@ function App() {
           </ProtectedRoute>
         }
       />
-      <Route path="/search" element={<Navigate to="/dashboard" replace />} />
+      {/* Product Search - Buy from other pharmacies */}
+      <Route
+        path="/search"
+        element={
+          <ProtectedRoute allowedRoles={['owner', 'seller', 'employee']}>
+            <ProductSearch />
+          </ProtectedRoute>
+        }
+      />
       <Route path="*" element={<Navigate to="/login" replace />} />
     </Routes>
   )

marketplace/src/pages/EmployeeDashboard.tsx

@@ -1,4 +1,5 @@
 import { useAuth } from '../context/AuthContext'
+import { Link } from 'react-router-dom'
 
 export function EmployeeDashboardPage() {
     const { user, logout } = useAuth()
@@ -11,6 +12,13 @@ export function EmployeeDashboardPage() {
                         <h1 className="text-2xl font-bold text-gray-900">Painel do Colaborador</h1>
                         <p className="text-gray-600">Bem-vindo, {user?.name}</p>
                     </div>
+                    <div className="flex gap-3">
+                        <Link
+                            to="/search"
+                            className="rounded bg-green-600 px-4 py-2 font-bold text-white hover:bg-green-700"
+                        >
+                            🛒 Comprar Medicamentos
+                        </Link>
                         <button
                             onClick={logout}
                             className="rounded bg-red-600 px-4 py-2 font-bold text-white hover:bg-red-700"
@@ -18,8 +26,13 @@ export function EmployeeDashboardPage() {
                             Sair
                         </button>
                     </div>
+                </div>
 
-                <div className="mt-8 grid gap-6 md:grid-cols-2">
+                <div className="mt-8 grid gap-6 md:grid-cols-3">
+                    <Link to="/search" className="rounded-lg bg-white p-6 shadow hover:shadow-lg transition-shadow">
+                        <h3 className="text-lg font-bold text-green-600">🛒 Comprar Medicamentos</h3>
+                        <p className="mt-2 text-gray-600">Encontrar medicamentos próximos à venda.</p>
+                    </Link>
                     <div className="rounded-lg bg-white p-6 shadow">
                         <h3 className="text-lg font-bold">Pedidos</h3>
                         <p className="mt-2 text-gray-600">Gerenciar pedidos recebidos.</p>

marketplace/src/pages/SellerDashboard.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useState } from 'react'
+import { Link } from 'react-router-dom'
 import { Shell } from '../layouts/Shell'
 import { apiClient } from '../services/apiClient'
 import { formatCents } from '../utils/format'
@@ -59,6 +60,13 @@ export function SellerDashboardPage() {
                         <h1 className="text-xl font-semibold text-medicalBlue">Dashboard do Vendedor</h1>
                         <p className="text-sm text-gray-600">Métricas e indicadores de performance</p>
                     </div>
+                    <div className="flex gap-3">
+                        <Link
+                            to="/search"
+                            className="rounded bg-green-600 px-4 py-2 text-sm font-semibold text-white hover:bg-green-700"
+                        >
+                            🛒 Comprar Medicamentos
+                        </Link>
                         <button
                             onClick={loadDashboard}
                             className="rounded bg-medicalBlue px-4 py-2 text-sm font-semibold text-white"
@@ -66,6 +74,7 @@ export function SellerDashboardPage() {
                             Atualizar
                         </button>
                     </div>
+                </div>
 
                 {loading && (
                     <div className="flex justify-center py-8">