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

frontend/src/components/SchemaSidebar.tsx

@@ -14,6 +14,8 @@ interface Props {
   instanceId: string;
   database: string;
   dbType: string;
+  /** Redis 集群模式为 true */
+  clusterMode?: boolean;
   onInsert: (text: string) => void;
   onDatabaseChange?: (db: string) => void;
   /** 为 true 时只显示当前选中的库，不允许切换（数据变更场景防误操作） */
@@ -193,7 +195,7 @@ function formatTTL(ttl: number): string {
 /*  COMPONENT                                                           */
 /* ================================================================== */
 
-export default function SchemaSidebar({ instanceId, database, dbType, onInsert, onDatabaseChange, singleDb }: Props) {
+export default function SchemaSidebar({ instanceId, database, dbType, clusterMode, onInsert, onDatabaseChange, singleDb }: Props) {
   const isMySQL = dbType === 'mysql' || dbType === 'postgres' || dbType === 'postgresql';
   const isRedis = dbType === 'redis';
 
@@ -617,6 +619,11 @@ export default function SchemaSidebar({ instanceId, database, dbType, onInsert,
           <div className="h-full flex flex-col">
             {/* DB + Search */}
             <div className="px-2 py-2 border-b border-[var(--dg-border-light)] space-y-1.5">
+              {clusterMode ? (
+                <div className="px-2 py-1 text-[10px] text-amber-400 bg-amber-500/10 rounded text-center">
+                  集群模式 · DB0
+                </div>
+              ) : (
               <select
                 value={redisDb}
                 onChange={(e) => { setRedisDb(Number(e.target.value)); }}
@@ -626,6 +633,7 @@ export default function SchemaSidebar({ instanceId, database, dbType, onInsert,
                   <option key={i} value={i}>DB{i}</option>
                 ))}
               </select>
+              )}
               <div className="relative">
                 <Search className="absolute left-2 top-1/2 -translate-y-1/2 w-3 h-3 text-[var(--dg-text-muted)]" />
                 <input