feat: branch betos — propiedades, oferta de proveedores, chat en contratos y flujo de postulacion renovado

- Sistema de propiedades: tabla, modelo, CRUD API para que el cliente guarde direcciones nombradas
- Postulacion renovada: cliente elige propiedad sin precio ni fecha, sube fotos a GCS/S3
- Proveedores ofertan date_1, date_2 y amount al postularse via pivot; sort por fecha/monto/membresia
- Contratacion: selected_date recibe date_1 o date_2, amount desde pivot (depreca minimun_fee)
- Cancelacion/repostulacion: archive con status=perdido, related_postulation_id para vincular
- Chat en contratos activos: tabla contract_comments, controller, rutas web+API, vista panel, notificaciones bilingues
- PaymentIntent calcula amount desde pivot en vez de recibirlo del front
- getpendingcontracts: sin filtro de tiempo, filtra por status=active, agrega time_created
- Expiracion de postulaciones reducida a 1000 min

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Models/Postulations.php

@@ -6,6 +6,7 @@ use App\Models\User;
 use App\Models\Categories;
 use App\Models\Suppliers;
 use App\Models\Status;
+use App\Models\Property;
 use Illuminate\Database\Eloquent\Model;
 use TarfinLabs\LaravelSpatial\Casts\LocationCast;
 use TarfinLabs\LaravelSpatial\Traits\HasSpatial;
@@ -18,17 +19,22 @@ class Postulations extends Model
     protected $fillable = [
         'user_id',
         'category_id',
+        'property_id',
         'address',
         'int_number',
         'references',
         'appointment',
         'amount',
         'details',
+        'photos',
+        'status',
+        'related_postulation_id',
         'status_id',
     ];
 
     protected $casts = [
-        'location' => LocationCast::class
+        'location' => LocationCast::class,
+        'photos'   => 'array',
     ];
 
     public function user()
@@ -44,7 +50,19 @@ class Postulations extends Model
 
     public function suppliers()
     {
-        return $this->belongsToMany(Suppliers::class, 'postulations_suppliers', 'postulations_id', 'suppliers_id')->withTimestamps();
+        return $this->belongsToMany(Suppliers::class, 'postulations_suppliers', 'postulations_id', 'suppliers_id')
+                    ->withPivot('date_1', 'date_2', 'amount')
+                    ->withTimestamps();
+    }
+
+    public function property()
+    {
+        return $this->belongsTo(Property::class);
+    }
+
+    public function relatedPostulation()
+    {
+        return $this->belongsTo(Postulations::class, 'related_postulation_id');
     }
 
     public function status()