feat: SchemaSidebar 加宽 + Redis key 点击插入查询命令到编辑器

- QueriesPage grid 从 1:3 改为 2:3，sidebar 更宽
- RedisTree 新增 onInsert prop，点击叶子节点自动插入对应命令
- redisCommand(): string→GET, hash→HGETALL, list→LRANGE, set→SMEMBERS, zset→ZRANGE

frontend/src/pages/QueriesPage.tsx

@@ -709,10 +709,10 @@ function NewQueryPanel({
         )}
 
         {/* CodeMirror Editor + Schema Sidebar */}
-        <div className="grid grid-cols-1 lg:grid-cols-4 gap-4">
+        <div className="grid grid-cols-1 lg:grid-cols-5 gap-4">
           {/* Schema Sidebar */}
           {showSidebar && instanceId && (
-            <div className="lg:col-span-1 h-[280px]">
+            <div className="lg:col-span-2 h-[280px]">
               <SchemaSidebar
                 instanceId={instanceId}
                 database={database}
@@ -722,7 +722,7 @@ function NewQueryPanel({
             </div>
           )}
           {/* Editor */}
-          <div className={showSidebar && instanceId ? 'lg:col-span-3' : 'lg:col-span-4'}>
+          <div className={showSidebar && instanceId ? 'lg:col-span-3' : 'lg:col-span-5'}>
             <div className="dg-card overflow-hidden">
               <SqlEditor
             value={sql}