feat: use simpler nitro instead of nestjs to implement mock service

apps/backend-mock/utils/response.ts

@@ -0,0 +1,17 @@
+export function useResponseSuccess<T = any>(data: T) {
+  return {
+    code: 0,
+    data,
+    error: null,
+    message: 'ok',
+  };
+}
+
+export function useResponseError(message: string, error: any = null) {
+  return {
+    code: -1,
+    data: null,
+    error,
+    message,
+  };
+}