feat: add salary options with toggle and candidate proposal

Backend:
- Added migration 030_add_salary_negotiable.sql
- Added SalaryNegotiable field to Job model

Frontend:
- Updated PostJobPage with salary mode toggle (fixed/range)
- Added 'Candidato envia proposta' checkbox to hide salary
- Updated job submission logic and confirmation display

backend/internal/models/job.go

@@ -13,10 +13,11 @@ type Job struct {
 	Description string `json:"description" db:"description"`
 
 	// Salary
-	SalaryMin  *float64 `json:"salaryMin,omitempty" db:"salary_min"`
+	SalaryMin        *float64 `json:"salaryMin,omitempty" db:"salary_min"`
-	SalaryMax  *float64 `json:"salaryMax,omitempty" db:"salary_max"`
+	SalaryMax        *float64 `json:"salaryMax,omitempty" db:"salary_max"`
-	SalaryType *string  `json:"salaryType,omitempty" db:"salary_type"` // hourly, daily, weekly, monthly, yearly
+	SalaryType       *string  `json:"salaryType,omitempty" db:"salary_type"`   // hourly, daily, weekly, monthly, yearly
-	Currency   *string  `json:"currency,omitempty" db:"currency"`      // BRL, USD, EUR, GBP, JPY
+	Currency         *string  `json:"currency,omitempty" db:"currency"`        // BRL, USD, EUR, GBP, JPY
+	SalaryNegotiable bool     `json:"salaryNegotiable" db:"salary_negotiable"` // Candidate proposes salary
 
 	// Employment
 	EmploymentType *string `json:"employmentType,omitempty" db:"employment_type"` // full-time, part-time, dispatch, contract

backend/migrations/030_add_salary_negotiable.sql

@@ -0,0 +1,6 @@
+-- Migration: Add salary_negotiable column to jobs table
+-- Description: When true, salary is hidden and candidate sends proposal
+
+ALTER TABLE jobs ADD COLUMN IF NOT EXISTS salary_negotiable BOOLEAN DEFAULT false;
+
+COMMENT ON COLUMN jobs.salary_negotiable IS 'When true, salary is not displayed and candidate proposes their own';

frontend/src/app/post-job/page.tsx

@@ -62,10 +62,15 @@ export default function PostJobPage() {
         location: "",
         salaryMin: "",
         salaryMax: "",
+        salaryFixed: "", // For fixed salary mode
         employmentType: "",
         workMode: "remote",
+        salaryNegotiable: false, // Candidate proposes salary
     });
 
+    // Salary mode toggle: 'fixed' | 'range'
+    const [salaryMode, setSalaryMode] = useState<'fixed' | 'range'>('fixed');
+
     const formatPhoneForDisplay = (value: string) => {
         // Simple formatting to just allow numbers and basic separators if needed
         // For now, just pass through but maybe restrict chars?
@@ -135,9 +140,11 @@ export default function PostJobPage() {
                     title: job.title,
                     description: job.description,
                     location: job.location,
-                    salaryMin: job.salaryMin ? parseInt(job.salaryMin) : null,
+                    // Salary logic: if negotiable, send null values
-                    salaryMax: job.salaryMax ? parseInt(job.salaryMax) : null,
+                    salaryMin: job.salaryNegotiable ? null : (salaryMode === 'fixed' ? (job.salaryFixed ? parseInt(job.salaryFixed) : null) : (job.salaryMin ? parseInt(job.salaryMin) : null)),
-                    employmentType: job.employmentType,
+                    salaryMax: job.salaryNegotiable ? null : (salaryMode === 'fixed' ? (job.salaryFixed ? parseInt(job.salaryFixed) : null) : (job.salaryMax ? parseInt(job.salaryMax) : null)),
+                    salaryNegotiable: job.salaryNegotiable,
+                    employmentType: job.employmentType || null,
                     workMode: job.workMode,
                     status: "pending", // Pending review
                 }),
@@ -356,25 +363,60 @@ export default function PostJobPage() {
                                             />
                                         </div>
                                     </div>
-                                    <div className="grid grid-cols-2 gap-4">
+                                    {/* Salary Section */}
-                                        <div>
+                                    <div className="space-y-3">
-                                            <Label>Salário Mínimo (R$)</Label>
+                                        <div className="flex items-center justify-between">
-                                            <Input
+                                            <Label>Salário</Label>
-                                                type="number"
+                                            <label className="flex items-center gap-2 text-sm cursor-pointer">
-                                                value={job.salaryMin}
+                                                <input
-                                                onChange={(e) => setJob({ ...job, salaryMin: e.target.value })}
+                                                    type="checkbox"
-                                                placeholder="5000"
+                                                    checked={job.salaryNegotiable}
-                                            />
+                                                    onChange={(e) => setJob({ ...job, salaryNegotiable: e.target.checked })}
-                                        </div>
+                                                    className="rounded"
-                                        <div>
+                                                />
-                                            <Label>Salário Máximo (R$)</Label>
+                                                <span className="text-muted-foreground">Candidato envia proposta</span>
-                                            <Input
+                                            </label>
-                                                type="number"
-                                                value={job.salaryMax}
-                                                onChange={(e) => setJob({ ...job, salaryMax: e.target.value })}
-                                                placeholder="10000"
-                                            />
                                         </div>
+
+                                        {!job.salaryNegotiable && (
+                                            <>
+                                                {salaryMode === 'fixed' ? (
+                                                    <div>
+                                                        <Input
+                                                            type="number"
+                                                            value={job.salaryFixed}
+                                                            onChange={(e) => setJob({ ...job, salaryFixed: e.target.value })}
+                                                            placeholder="Valor"
+                                                        />
+                                                    </div>
+                                                ) : (
+                                                    <div className="grid grid-cols-2 gap-4">
+                                                        <Input
+                                                            type="number"
+                                                            value={job.salaryMin}
+                                                            onChange={(e) => setJob({ ...job, salaryMin: e.target.value })}
+                                                            placeholder="Mín"
+                                                        />
+                                                        <Input
+                                                            type="number"
+                                                            value={job.salaryMax}
+                                                            onChange={(e) => setJob({ ...job, salaryMax: e.target.value })}
+                                                            placeholder="Máx"
+                                                        />
+                                                    </div>
+                                                )}
+                                                <button
+                                                    type="button"
+                                                    onClick={() => setSalaryMode(salaryMode === 'fixed' ? 'range' : 'fixed')}
+                                                    className="flex items-center gap-1 text-sm text-primary hover:underline"
+                                                >
+                                                    <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15" />
+                                                    </svg>
+                                                    {salaryMode === 'fixed' ? 'Faixa salarial' : 'Salário fixo'}
+                                                </button>
+                                            </>
+                                        )}
                                     </div>
                                     <div className="grid grid-cols-2 gap-4">
                                         <div>
@@ -433,8 +475,14 @@ export default function PostJobPage() {
                                         </h3>
                                         <p><strong>Título:</strong> {job.title}</p>
                                         <p><strong>Localização:</strong> {job.location || "Não informado"}</p>
-                                        <p><strong>Salário:</strong> {job.salaryMin && job.salaryMax ? `R$ ${job.salaryMin} - R$ ${job.salaryMax}` : "A combinar"}</p>
+                                        <p><strong>Salário:</strong> {
-                                        <p><strong>Tipo:</strong> {job.employmentType} / {job.workMode}</p>
+                                            job.salaryNegotiable
+                                                ? "Candidato envia proposta"
+                                                : salaryMode === 'fixed'
+                                                    ? (job.salaryFixed ? `R$ ${job.salaryFixed}` : "A combinar")
+                                                    : (job.salaryMin && job.salaryMax ? `R$ ${job.salaryMin} - R$ ${job.salaryMax}` : "A combinar")
+                                        }</p>
+                                        <p><strong>Tipo:</strong> {job.employmentType || "Qualquer"} / {job.workMode}</p>
                                     </div>
                                     <div className="flex gap-3">
                                         <Button variant="outline" onClick={() => setStep(2)} className="flex-1">

frontend/src/lib/api.ts

@@ -319,6 +319,7 @@ export interface CreateJobPayload {
     salaryMax?: number;
     salaryType?: 'hourly' | 'daily' | 'weekly' | 'monthly' | 'yearly';
     currency?: 'BRL' | 'USD' | 'EUR' | 'GBP' | 'JPY';
+    salaryNegotiable?: boolean;  // When true, candidate proposes salary
     employmentType?: 'full-time' | 'part-time' | 'dispatch' | 'contract' | 'temporary' | 'training' | 'voluntary' | 'permanent';
     workingHours?: string;
     location?: string;