feat(api): Implement API Resource Standard compliance

- Create BaseResource with formatDate() and formatDecimal() utilities
- Create 11 API Resource classes for all models
- Update all 6 controllers to return wrapped responses via wrapResource()
- Update frontend API client with unwrapResponse() helper
- Update all 63+ backend tests to expect 'data' wrapper
- Regenerate Scribe API documentation

BREAKING CHANGE: All API responses now wrap data in 'data' key per architecture spec.

Backend Tests: 70 passed, 5 failed (unrelated to data wrapper)
Frontend Unit: 10 passed
E2E Tests: 102 passed, 20 skipped
API Docs: Generated successfully

Refs: openspec/changes/api-resource-standard

backend/app/Http/Controllers/Controller.php

@@ -2,7 +2,16 @@
 
 namespace App\Http\Controllers;
 
-abstract class Controller
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Resources\Json\JsonResource;
+use Illuminate\Routing\Controller as BaseController;
+
+class Controller extends BaseController
 {
-    //
+    protected function wrapResource(JsonResource $resource, int $status = 200): JsonResponse
+    {
+        return response()->json([
+            'data' => $resource->resolve(request()),
+        ], $status);
+    }
 }