feat: Implement user profile management with avatar upload and additional fields

- Added avatar_url, phone, bio, and preferences fields to UserTenant model.
- Updated UserService to handle user profile updates and retrieval.
- Created endpoints for getting and updating the current user's profile.
- Implemented avatar upload functionality with validation in routes.
- Enhanced frontend to manage user profile, including avatar preview and form handling.
- Added server-side logic for loading and updating user profile data.
- Updated .gitignore to include uploads directory.

.gitignore

@@ -59,4 +59,5 @@ node_modules/
 
 # Docker
 *.dockerignore
-postgres-data/
+postgres-data/
+backend/uploads/avatars