feat: Redis cluster UI - SchemaSidebar 集群db0锁定 + InstanceItem cluster_mode 字段

frontend/src/pages/QueriesPage.tsx

@@ -111,7 +111,7 @@ export default function QueriesPage() {
   const [database, setDatabase] = useState('');
   const [databases, setDatabases] = useState<string[]>([]);
   const [loadingDbs, setLoadingDbs] = useState(false);
-  const [instances, setInstances] = useState<Array<{ id: number; name: string; host: string; port: number; db_type: string }>>([]);
+  const [instances, setInstances] = useState<Array<{ id: number; name: string; host: string; port: number; db_type: string; cluster_mode?: boolean }>>([]);
   const [editorSchema, setEditorSchema] = useState<Record<string, Record<string, string[]>>>({});
   const [executing, setExecuting] = useState(false);
   const [error, setError] = useState('');
@@ -432,6 +432,7 @@ export default function QueriesPage() {
           {showSidebar && instanceId && (
             <div className="w-[280px] shrink-0">
               <SchemaSidebar instanceId={instanceId} database={database} dbType={dbType}
+                clusterMode={selectedInstance?.cluster_mode}
                 onInsert={(text) => {
                   const sep = dbType === 'redis' ? (sql.trim() ? '\n' : '') : (sql.trim() ? ' ' : '');
                   setSql(prev => prev + sep + text + (dbType === 'redis' ? '' : ' '));