fix: Redis查询核心bug修复 — 命令拆分+HGETALL结构化+DB号+插入换行

1. executeRedisQuery: client.Do()没传命令名导致ERR unknown command
2. HGETALL结果用reflect处理map类型,结构化输出field/value表格
3. 支持指定Redis DB号(之前固定DB=0)
4. 前端Redis命令插入用换行分隔,MySQL保持空格
5. cost_ms到execution_time_ms字段映射修复

frontend/src/pages/QueriesPage.tsx

@@ -210,13 +210,14 @@ export default function QueriesPage() {
     setExecuting(true); setError(''); setResult(null);
     try {
       const res = await queryApi.execute({ instance_id: Number(instanceId), database: database || undefined, sql }) as unknown as QueryResult;
-      if (res.error) {
-        setError(res.error);
+      const normalized = { ...res, execution_time_ms: res.execution_time_ms || res.cost_ms || 0 };
+      if (normalized.error) {
+        setError(normalized.error);
         setResult(null);
       } else {
-        setResult(res);
+        setResult(normalized);
       }
-      setHistory(prev => [{ id: Date.now(), sql, instance_id: Number(instanceId), database, db_type: dbType, status: 'success', execution_time_ms: res.execution_time_ms || 0, result_preview: JSON.stringify(res.rows?.[0] || {}).substring(0, 100), created_at: new Date().toISOString(), favorite: false }, ...prev]);
+      setHistory(prev => [{ id: Date.now(), sql, instance_id: Number(instanceId), database, db_type: dbType, status: 'success', execution_time_ms: normalized.execution_time_ms, result_preview: JSON.stringify(normalized.rows?.[0] || {}).substring(0, 100), created_at: new Date().toISOString(), favorite: false }, ...prev]);
     } catch (e: unknown) {
       const raw = (e as { response?: { data?: { detail?: string | Array<{ msg: string }> } } })?.response?.data?.detail;
       const msg = Array.isArray(raw) ? raw.map(v => v.msg).join('; ') : (raw || '查询失败');
@@ -394,7 +395,10 @@ export default function QueriesPage() {
           {showSidebar && instanceId && (
             <div className="w-[280px] shrink-0">
               <SchemaSidebar instanceId={instanceId} database={database} dbType={dbType}
-                onInsert={(text) => setSql(prev => prev + (prev.trim() ? ' ' : '') + text + ' ')} />
+                onInsert={(text) => {
+                  const sep = dbType === 'redis' ? (sql.trim() ? '\n' : '') : (sql.trim() ? ' ' : '');
+                  setSql(prev => prev + sep + text + (dbType === 'redis' ? '' : ' '));
+                }} />
             </div>
           )}