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/features/inventory/types.ts

@@ -101,6 +101,10 @@ export type Recipe = {
   instructions: string | null;
   imageUrl: string | null;
   servings: number | null;
+  isPublic: boolean;
+  ownerId: number | null;
+  owner: { id: number; username: string } | null;
+  shares: { userId: number }[];
   createdAt: string;
   updatedAt: string;
   ingredients: RecipeIngredient[];