fix(gateway): add chat_id to hook_ctx for message source tracking

gateway/run.py

@@ -7543,6 +7543,7 @@ class GatewayRunner:
             hook_ctx = {
                 "platform": source.platform.value if source.platform else "",
                 "user_id": source.user_id,
+                "chat_id": source.chat_id or "",
                 "session_id": session_entry.session_id,
                 "message": message_text[:500],
             }