Add detailed session debugging

- Log session keys and contents when user not found
- This will help diagnose why session data isn't persisting
- Show exactly what's in the session during dependency injection

backend/dependencies.py

@@ -118,7 +118,10 @@ def get_current_user_optional(request: Request) -> Optional[Dict[str, Any]]:
             logger.info(f"🔓 Found authenticated user: {user.get('username', 'unknown')}")
             return user
         else:
-            logger.debug("🔍 No user found in session")
+            # Add detailed debugging for session contents
+            session_keys = list(request.session.keys()) if hasattr(request.session, 'keys') else []
+            logger.debug(f"🔍 No user found in session for {request.url.path}. Session keys: {session_keys}")
+            logger.debug(f"🔍 Full session contents: {dict(request.session) if hasattr(request.session, 'keys') else 'no session'}")
             return None
     except Exception as e:
         logger.error(f"Session access failed: {e}")