feat: add centralized error logging system

- Implemented Error Log API to capture and store error logs from various services.
- Updated admin_ui to include Error Log Viewer component for inspecting logs.
- Enhanced error handling in auth_api, employee_api, and transit_api to report errors to the Error Log API.
- Modified existing services to utilize the new error logging functionality.
- Updated Docker Compose configuration to include the Error Log API service.
- Added error logging service in bus_terminal for Flutter application.

admin_ui/src/components/LinkStop.jsx

@@ -13,7 +13,7 @@ export default function LinkStop({ token, user }) {
   const [draggedItem, setDraggedItem] = useState(null)
   const [deleteConfirm, setDeleteConfirm] = useState(null)
 
-  const isAdmin = Boolean(user?.userCode)
+  const isAdmin = Boolean(user?.isAdmin)
 
   const nextOrder = useMemo(() => stops.length + 1, [stops])