feat: add backend-mock app

apps/backend-mock/src/modules/health/health.controller.ts

@@ -0,0 +1,11 @@
+import { Public } from '@/core/decorator';
+import { Controller, Get } from '@nestjs/common';
+
+@Controller()
+export class HealthController {
+  @Public()
+  @Get()
+  getHeart(): string {
+    return 'ok';
+  }
+}