Fix JWT session creation causing 500 errors

Fix session creation workflow:
- Store session data in JWT session manager after creation
- Update get_session to check stored session data
- Prevent 500 errors when creating new sessions

Resolves 'Failed to create session' 500 errors in frontend

v1.0.9

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/core/jwt_session.py

@@ -46,12 +46,20 @@ class JWTSessionManager:
             "conversation_started": False
         }
 
-        # Return the session ID (JWT token will be created when needed)
+        # Store the session data for retrieval
+        self.session_data = getattr(self, 'session_data', {})
+        self.session_data[session_id] = session_data
+
         return session_id
 
     def get_session(self, session_id: str) -> Optional[Dict]:
         """Retrieve session data (for compatibility - JWT will be handled at API level)."""
-        # This will be overridden to work with JWT tokens at the API level
+        # Check stored session data first
+        session_data_store = getattr(self, 'session_data', {})
+        if session_id in session_data_store:
+            return session_data_store[session_id]
+
+        # Fallback: check if conversation exists
         if session_id in self.conversations:
             return {
                 "session_id": session_id,