chore: cleanup return message

Author: zzswang

src/app.controller.ts

@@ -52,13 +52,14 @@ export class AppController {
     type: AppResult,
   })
   @Get('/cleanup')
-  async cleanup(): Promise<void> {
+  async cleanup(): Promise<AppResult> {
     await this.emailRecordService.cleanupAllData();
     await this.smsRecordService.cleanupAllData();
     await this.captchaService.cleanupAllData();
     await this.sessionService.cleanupAllData();
     await this.userService.cleanupAllData();
     await this.groupService.cleanupAllData();
     await this.namespaceService.cleanupAllData();
+    return { message: 'Cleanup successfully!' };
   }
 }