feat: Initial Laravel API-only starter kit

- Laravel 12 with Sanctum authentication
- API versioning with grazulex/laravel-apiroute
- spatie/laravel-query-builder for filtering/sorting
- spatie/laravel-data for DTOs
- dedoc/scramble for auto API documentation
- Pest PHP testing framework
- Docker development environment
- Standardized JSON API responses
- Rate limiting and CORS configuration
- Comprehensive README documentation

app/Traits/ApiResponse.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace App\Traits;
+
+use Illuminate\Http\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+
+trait ApiResponse
+{
+    protected function success(
+        mixed $data = null,
+        string $message = 'Success',
+        int $code = Response::HTTP_OK
+    ): JsonResponse {
+        return response()->json([
+            'success' => true,
+            'message' => $message,
+            'data' => $data,
+        ], $code);
+    }
+
+    protected function created(
+        mixed $data = null,
+        string $message = 'Resource created successfully'
+    ): JsonResponse {
+        return $this->success($data, $message, Response::HTTP_CREATED);
+    }
+
+    protected function noContent(): JsonResponse
+    {
+        return response()->json(null, Response::HTTP_NO_CONTENT);
+    }
+
+    protected function error(
+        string $message = 'Error',
+        int $code = Response::HTTP_BAD_REQUEST,
+        array $errors = []
+    ): JsonResponse {
+        $response = [
+            'success' => false,
+            'message' => $message,
+        ];
+
+        if (! empty($errors)) {
+            $response['errors'] = $errors;
+        }
+
+        return response()->json($response, $code);
+    }
+
+    protected function notFound(string $message = 'Resource not found'): JsonResponse
+    {
+        return $this->error($message, Response::HTTP_NOT_FOUND);
+    }
+
+    protected function unauthorized(string $message = 'Unauthorized'): JsonResponse
+    {
+        return $this->error($message, Response::HTTP_UNAUTHORIZED);
+    }
+
+    protected function forbidden(string $message = 'Forbidden'): JsonResponse
+    {
+        return $this->error($message, Response::HTTP_FORBIDDEN);
+    }
+
+    protected function validationError(array $errors, string $message = 'Validation failed'): JsonResponse
+    {
+        return $this->error($message, Response::HTTP_UNPROCESSABLE_ENTITY, $errors);
+    }
+}