chore: migrate backend to monorepo apps and biome

apps/bookings/src/bookings.controller.ts

@@ -0,0 +1,12 @@
+import { Controller, Get } from '@nestjs/common';
+import { BookingsService } from './bookings.service';
+
+@Controller()
+export class BookingsController {
+  constructor(private readonly bookingsService: BookingsService) {}
+
+  @Get()
+  getHello(): string {
+    return this.bookingsService.getHello();
+  }
+}