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.

frontend/app/api/recipe-preview-proxy/route.ts

@@ -1,8 +1,10 @@
 import { NextRequest, NextResponse } from 'next/server';
+import { getAuthHeaders } from '../../../lib/auth-headers';
 
 const API_BASE = process.env.NEXT_PUBLIC_API_URL_INTERNAL || 'http://recipe-api:8080';
 
 export async function GET(request: NextRequest) {
+  const authHeaders = await getAuthHeaders();
   const id = request.nextUrl.searchParams.get('id');
 
   if (!id) {
@@ -14,6 +16,7 @@ export async function GET(request: NextRequest) {
 
   const res = await fetch(`${API_BASE}/api/recipes/${id}/inventory-preview`, {
     method: 'GET',
+    headers: { ...authHeaders },
     cache: 'no-store',
   });