feat(auth): implement user authentication with JWT and NextAuth

- Added user registration and login functionality with JWT authentication.
- Created auth controller, service, and module in the backend.
- Implemented user model and user products management.
- Integrated NextAuth for session management on the frontend.
- Added middleware for protecting routes and handling public access.
- Updated frontend API routes to include authorization headers.
- Enhanced recipe and user product models to support ownership and visibility.
- Created registration and login pages in the frontend.
- Added necessary types for NextAuth session management.

backend/src/health/health.controller.ts

@@ -1,7 +1,9 @@
 import { Controller, Get, HttpCode, Res } from '@nestjs/common';
 import { Response } from 'express';
 import { HealthService } from './health.service';
+import { Public } from '../auth/decorators/public.decorator';
 
+@Public()
 @Controller('health')
 export class HealthController {
   constructor(private readonly healthService: HealthService) {}