🔧fix(mongodb): 修复MongoDB查询仅返回一条数据的问题

- queryWithContext 中 find/count 命令改用原生 Collection.Find()和 CountDocuments() API，替代RunCommand 的 firstBatch 模式
- 新增 convertBsonValue 将 ObjectID/bson.M/bson.D/bson.A 转为JSON 友好类型，_id 列自动置首
- DBQuery 增加 MongoDB JSON 命令识别，避免 find 命令误走 Exec 分支

⚡️perf(macos): 动态控制 NSVisualEffectView 降低 MacOS GPU 持续消耗，Windows不受影响

- NSVisualEffectView 启动默认 alpha 由 0.72 改为 0，窗口默认 opaque
- 新增 gonaviSetEffectViewAlpha ObjC 函数支持运行时动态切换
- 新增 SetWindowTranslucency Wails 绑定方法供前端调用
- 启动重试次数由 24 次缩减至 8 次
- opacity=1.0 且 blur=0 时窗口标记 opaque，GPU 不再持续计算模糊合成
- App.tsx 仅保留最外层 Layout 的 backdropFilter，移除 TitleBar/MenuBar/Content/DataGrid/LogPanel 冗余嵌套
- App.css 移除暗色模式全局 text-shadow 减少 compositing 开销

frontend/src/components/QueryEditor.tsx

@@ -196,6 +196,9 @@ const QueryEditor: React.FC<{ tab: TabData }> = ({ tab }) => {
       editorRef.current = editor;
       monacoRef.current = monaco;
 
+      // 应用透明主题（主题已在 main.tsx 全局注册）
+      monaco.editor.setTheme(darkMode ? 'transparent-dark' : 'transparent-light');
+
       monaco.languages.registerCompletionItemProvider('sql', {
           triggerCharacters: ['.'],
           provideCompletionItems: async (model: any, position: any) => {
@@ -1211,7 +1214,7 @@ const QueryEditor: React.FC<{ tab: TabData }> = ({ tab }) => {
           transition: none !important;
         }
       `}</style>
-      <div style={{ padding: '8px', borderBottom: '1px solid #eee', display: 'flex', gap: '8px', flexShrink: 0, alignItems: 'center' }}>
+      <div style={{ padding: '8px', display: 'flex', gap: '8px', flexShrink: 0, alignItems: 'center' }}>
         <Select 
             style={{ width: 150 }} 
             placeholder="选择连接"
@@ -1265,11 +1268,11 @@ const QueryEditor: React.FC<{ tab: TabData }> = ({ tab }) => {
         </Button.Group>
       </div>
       
-      <div style={{ height: editorHeight, minHeight: '100px', borderBottom: '1px solid #eee' }}>
+      <div style={{ height: editorHeight, minHeight: '100px' }}>
         <Editor 
           height="100%" 
           defaultLanguage="sql" 
-          theme={darkMode ? "vs-dark" : "light"}
+          theme={darkMode ? "transparent-dark" : "transparent-light"}
           value={query} 
           onChange={(val) => setQuery(val || '')}
           onMount={handleEditorDidMount}
@@ -1287,7 +1290,7 @@ const QueryEditor: React.FC<{ tab: TabData }> = ({ tab }) => {
         style={{ 
             height: '5px', 
             cursor: 'row-resize', 
-            background: darkMode ? '#333' : '#f0f0f0',
+            background: darkMode ? 'rgba(255,255,255,0.08)' : 'rgba(0,0,0,0.04)',
             flexShrink: 0,
             zIndex: 10 
         }}