Fix: Correcciones panel admin y API frontend

## Panel de Administración

### FormBuilder personalizado (Laravel 11)
- Creado app/Support/FormBuilder.php como reemplazo de laravelcollective/html
- Creado app/Support/Facades/Form.php para el facade
- Registrado en AppServiceProvider y config/app.php
- Soporta: text, email, password, file, textarea, select, checkbox, radio, etc.
- Manejo de valores null en todos los parámetros

### Configuración de sesión
- Cambiado same_site de "none" a "lax" para compatibilidad HTTP
- Corrige error 419 Page Expired en login

### Status CRUD
- Agregado campo en_name al formulario (español/inglés)
- Actualizado StatusController create/update para manejar en_name

### Dependencias
- Instalado spatie/laravel-google-cloud-storage para driver GCS

## API Frontend

### Validaciones de perfil de proveedor
Agregadas validaciones en endpoints que requieren perfil de proveedor:

- SupplierController::getpostulation - Retorna error 400 si no hay perfil
- SupplierController::getcontractedpostulation - Retorna error 400 si no hay perfil
- PostulationController::postulate - Retorna error 400 si no hay perfil
- PostulationController::getfinishedpostulations - Retorna error 400 si no hay perfil
- ContractController::startcontract - Retorna error 400 si no hay perfil

### Null safety en contratos
- ContractController::getcurrentcontracts - Manejo seguro de supplier/category null
- ContractController::getfinishedcontracts - Manejo seguro de supplier/category/status null

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/Http/Controllers/ContractController.php

@@ -639,12 +639,12 @@ class ContractController extends Controller
           $day_limit = Carbon::parse($ccontract->created_at);
           $currentcontractinfo = array(
             'id' => $ccontract->id,
-            'phone' => $supplier->user->phone,
-            'category' => $category->name,
-            'en_category' => $category->en_name,
+            'phone' => $supplier ? ($supplier->user ? $supplier->user->phone : null) : null,
+            'category' => $category ? $category->name : null,
+            'en_category' => $category ? $category->en_name : null,
             'address' => $ccontract->address,
             'date' => $ccontract->appointment,
-            'supplier' => $supplier->company_name,
+            'supplier' => $supplier ? $supplier->company_name : 'Proveedor no disponible',
             'status' => $ccontract->status_id,
             'amount' => $ccontract->amount,
             'code' => $ccontract->code,
@@ -778,6 +778,14 @@ class ContractController extends Controller
 
         $user = Auth::user();
         $supplier = $user->suppliers;
+
+        if (!$supplier) {
+          return response()->json([
+            'success' => false,
+            'message' => 'No tienes un perfil de proveedor registrado'
+          ], 400);
+        }
+
         $ccontract = CurrentContracts::where('code', $request->contract_pin)->where('supplier_id', $supplier->id)->first();
 
         if($ccontract) {
@@ -969,16 +977,16 @@ class ContractController extends Controller
           $day_limit = Carbon::parse($fcontract->created_at);
           $finishedcontractinfo = array(
             'id' => $fcontract->id,
-            'category' => $category->name,
-            'en_category' => $category->en_name,
+            'category' => $category ? $category->name : null,
+            'en_category' => $category ? $category->en_name : null,
             'address' => $fcontract->address,
             'date' => $fcontract->appointment,
             'date_difference' => $time_limit->diff(Carbon::now(), false)->days,
-            'supplier' => $supplier->company_name,
+            'supplier' => $supplier ? $supplier->company_name : 'Proveedor no disponible',
             'amount' => $fcontract->amount,
             'scored' => $fcontract->scored_at,
             'parent' => $fcontract->parent_contract_id,
-            'status' => $fcontract->status->name
+            'status' => $fcontract->status ? $fcontract->status->name : null
           );
           $finishedcontracts[] = $finishedcontractinfo;
         }