feat(projects): Plan 5 Task 3 — store + StoreProjectRequest + ProjectService::create

- StoreProjectRequest: 3-way conditional validation (site domain regex, call 7\d{10}, sms senders required)
- ProjectService::create(): max_projects limit check via Tenant.limits JSONB + dispatch SyncSupplierProjectJob
- ProjectController: constructor DI + store() method returning 201
- SyncSupplierProjectJob: stub (Task 4 полная реализация)
- POST /api/projects route inside auth:sanctum+tenant group (name projects.store)
- Migration add_limits_to_tenants: JSONB DEFAULT '{}' per-tenant limits column
- Tenant model: limits added to fillable + casts as array
- schema.sql/CHANGELOG: tenants.limits documented in v8.20
- phpstan-baseline: +8 actingAs entries for new test file
- Quirk: region_mode in request uses 'include'/'exclude' (schema CHECK) not 'all'/'whitelist' (plan spec typo)
- Quirk: Project::first() → Project::where('signal_identifier','x.ru')->latest()->first() (no RefreshDatabase, persistent test DB)
- 8/8 ProjectsStoreTest passed; 699/706 total (4 pre-existing failures unchanged)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/app/Http/Controllers/Api/ProjectController.php

@@ -5,8 +5,10 @@ declare(strict_types=1);
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
+use App\Http\Requests\StoreProjectRequest;
 use App\Http\Resources\ProjectResource;
 use App\Models\Project;
+use App\Services\Project\ProjectService;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 
@@ -21,6 +23,8 @@ use Illuminate\Http\Request;
  */
 class ProjectController extends Controller
 {
+    public function __construct(private readonly ProjectService $projects) {}
+
     /** GET /api/projects */
     public function index(Request $request): JsonResponse
     {
@@ -78,6 +82,14 @@ class ProjectController extends Controller
         ]);
     }
 
+    /** POST /api/projects */
+    public function store(StoreProjectRequest $request): JsonResponse
+    {
+        $project = $this->projects->create($request->user()->tenant, $request->validated());
+
+        return response()->json(['data' => new ProjectResource($project)], 201);
+    }
+
     /** GET /api/projects/{id} */
     public function show(Request $request, int $id): JsonResponse
     {