✨ feat(shortcuts): 把 SQL 诊断与慢查询快捷键注册到管理系统并加菜单入口

- 注册到系统：diagnoseQuery 与 showSlowQueries 加入 ShortcutAction，可在快捷键管理面板自定义
- 修复冲突：原硬编码 Ctrl+Shift+D 与 toggleTheme 冲突、Ctrl+Shift+H 与 toggleLogPanel 冲突；改为 Ctrl+Shift+P / Ctrl+Shift+L
- 菜单入口：QueryEditor 的"更多"下拉加 SQL 诊断、慢 SQL 历史两个菜单项，附带快捷键提示
- i18n 同步：6 种语言补齐 label/description

frontend/src/components/QueryEditor.tsx

@@ -2211,9 +2211,8 @@ const QueryEditor: React.FC<{ tab: TabData; isActive?: boolean }> = ({ tab, isAc
   const [saveModalMode, setSaveModalMode] = useState<'save' | 'rename'>('save');
   const [saveForm] = Form.useForm();
 
-  // SQL 诊断工作台：Ctrl+Shift+D 触发（Mac 为 Cmd+Shift+D）
+  // SQL 诊断工作台与慢 SQL 历史：通过快捷键管理系统注册（避免与 toggleTheme/toggleLogPanel 冲突）
   const [explainOpen, setExplainOpen] = useState(false);
-  // 慢 SQL 历史：Ctrl+Shift+H 触发
   const [slowQueryOpen, setSlowQueryOpen] = useState(false);
 
   // Database Selection
@@ -2275,23 +2274,6 @@ const QueryEditor: React.FC<{ tab: TabData; isActive?: boolean }> = ({ tab, isAc
     } as any;
   }, [connections, currentConnectionId]);
 
-  useEffect(() => {
-    if (!isActive) return;
-    const handler = (e: KeyboardEvent) => {
-      if (!(e.ctrlKey || e.metaKey) || !e.shiftKey) return;
-      const key = e.key.toLowerCase();
-      if (key === 'd') {
-        e.preventDefault();
-        setExplainOpen(true);
-      } else if (key === 'h') {
-        e.preventDefault();
-        setSlowQueryOpen(true);
-      }
-    };
-    window.addEventListener('keydown', handler);
-    return () => window.removeEventListener('keydown', handler);
-  }, [isActive]);
-
   const addSqlLog = useStore(state => state.addSqlLog);
   const addTab = useStore(state => state.addTab);
   const setActiveContext = useStore(state => state.setActiveContext);
@@ -2323,6 +2305,33 @@ const QueryEditor: React.FC<{ tab: TabData; isActive?: boolean }> = ({ tab, isAc
       () => resolveShortcutBinding(shortcutOptions, 'runQuery', activeShortcutPlatform),
       [activeShortcutPlatform, shortcutOptions],
   );
+  // SQL 诊断 / 慢 SQL 历史的快捷键绑定（从 store 读取，用户可在快捷键管理面板自定义）
+  const diagnoseQueryShortcutBinding = useMemo(
+      () => resolveShortcutBinding(shortcutOptions, 'diagnoseQuery', activeShortcutPlatform),
+      [activeShortcutPlatform, shortcutOptions],
+  );
+  const showSlowQueriesShortcutBinding = useMemo(
+      () => resolveShortcutBinding(shortcutOptions, 'showSlowQueries', activeShortcutPlatform),
+      [activeShortcutPlatform, shortcutOptions],
+  );
+
+  // SQL 诊断 / 慢 SQL 历史的快捷键监听（必须在 binding 声明之后）
+  useEffect(() => {
+    if (!isActive) return;
+    const handler = (e: KeyboardEvent) => {
+      if (diagnoseQueryShortcutBinding?.enabled && isShortcutMatch(e, diagnoseQueryShortcutBinding.combo)) {
+        e.preventDefault();
+        setExplainOpen(true);
+        return;
+      }
+      if (showSlowQueriesShortcutBinding?.enabled && isShortcutMatch(e, showSlowQueriesShortcutBinding.combo)) {
+        e.preventDefault();
+        setSlowQueryOpen(true);
+      }
+    };
+    window.addEventListener('keydown', handler);
+    return () => window.removeEventListener('keydown', handler);
+  }, [isActive, diagnoseQueryShortcutBinding, showSlowQueriesShortcutBinding]);
   const selectCurrentStatementShortcutBinding = useMemo(
       () => resolveShortcutBinding(shortcutOptions, 'selectCurrentStatement', activeShortcutPlatform),
       [activeShortcutPlatform, shortcutOptions],
@@ -5840,6 +5849,35 @@ const QueryEditor: React.FC<{ tab: TabData; isActive?: boolean }> = ({ tab, isAc
           label: translate('query_editor.action.export_sql_file'),
           onClick: () => void handleExportSQLFile(),
       },
+      { type: 'divider' },
+      {
+          key: 'diagnose-query',
+          label: (
+              <span>
+                  {translate('app.shortcuts.action.diagnoseQuery.label' as any) || 'SQL 诊断'}
+                  {diagnoseQueryShortcutBinding?.enabled && diagnoseQueryShortcutBinding.combo && (
+                      <span style={{ marginLeft: 8, color: 'var(--gn-text-muted, #6c757d)', fontSize: 11 }}>
+                          {getShortcutDisplayLabel(diagnoseQueryShortcutBinding.combo, activeShortcutPlatform)}
+                      </span>
+                  )}
+              </span>
+          ),
+          onClick: () => setExplainOpen(true),
+      },
+      {
+          key: 'show-slow-queries',
+          label: (
+              <span>
+                  {translate('app.shortcuts.action.showSlowQueries.label' as any) || '慢 SQL 历史'}
+                  {showSlowQueriesShortcutBinding?.enabled && showSlowQueriesShortcutBinding.combo && (
+                      <span style={{ marginLeft: 8, color: 'var(--gn-text-muted, #6c757d)', fontSize: 11 }}>
+                          {getShortcutDisplayLabel(showSlowQueriesShortcutBinding.combo, activeShortcutPlatform)}
+                      </span>
+                  )}
+              </span>
+          ),
+          onClick: () => setSlowQueryOpen(true),
+      },
   ];
 
   useEffect(() => {

frontend/src/utils/shortcuts.ts

@@ -18,7 +18,9 @@ export type ShortcutAction =
   | 'toggleTheme'
   | 'openShortcutManager'
   | 'toggleMacFullscreen'
-  | 'resetWindowZoom';
+  | 'resetWindowZoom'
+  | 'diagnoseQuery'
+  | 'showSlowQueries';
 
 export type ShortcutPlatform = 'mac' | 'windows';
 
@@ -111,6 +113,8 @@ export const SHORTCUT_ACTION_ORDER: ShortcutAction[] = [
   'toggleAIPanel',
   'toggleLogPanel',
   'toggleTheme',
+  'diagnoseQuery',
+  'showSlowQueries',
   'openShortcutManager',
   'toggleMacFullscreen',
   'resetWindowZoom',
@@ -202,6 +206,18 @@ const SHORTCUT_ACTION_META_DEFINITIONS: Record<ShortcutAction, ShortcutActionMet
     labelKey: 'app.shortcuts.action.toggleTheme.label',
     descriptionKey: 'app.shortcuts.action.toggleTheme.description',
   },
+  diagnoseQuery: {
+    labelKey: 'app.shortcuts.action.diagnoseQuery.label',
+    descriptionKey: 'app.shortcuts.action.diagnoseQuery.description',
+    scope: 'queryEditor',
+    allowInEditable: true,
+  },
+  showSlowQueries: {
+    labelKey: 'app.shortcuts.action.showSlowQueries.label',
+    descriptionKey: 'app.shortcuts.action.showSlowQueries.description',
+    scope: 'queryEditor',
+    allowInEditable: true,
+  },
   openShortcutManager: {
     labelKey: 'app.shortcuts.action.openShortcutManager.label',
     descriptionKey: 'app.shortcuts.action.openShortcutManager.description',
@@ -279,6 +295,16 @@ export const DEFAULT_SHORTCUT_OPTIONS: ShortcutOptions = {
     mac: { combo: 'Meta+Shift+D', enabled: true },
     windows: { combo: 'Ctrl+Shift+D', enabled: true },
   },
+  // SQL 诊断：避开 toggleTheme 的 Ctrl+Shift+D，用 Ctrl+Shift+P（P = Plan）
+  diagnoseQuery: {
+    mac: { combo: 'Meta+Shift+P', enabled: true },
+    windows: { combo: 'Ctrl+Shift+P', enabled: true },
+  },
+  // 慢查询历史：避开 toggleLogPanel 的 Ctrl+H / Meta+Shift+H，用 Ctrl+Shift+L（L = Log）
+  showSlowQueries: {
+    mac: { combo: 'Meta+Shift+L', enabled: true },
+    windows: { combo: 'Ctrl+Shift+L', enabled: true },
+  },
   openShortcutManager: {
     mac: { combo: 'Meta+,', enabled: true },
     windows: { combo: 'Ctrl+,', enabled: true },

shared/i18n/de-DE.json

@@ -386,6 +386,10 @@
   "app.shortcuts.action.toggleMacFullscreen.label": "Nativen Vollbildmodus umschalten",
   "app.shortcuts.action.toggleTheme.description": "Zwischen hellem und dunklem Theme wechseln",
   "app.shortcuts.action.toggleTheme.label": "Theme umschalten",
+  "app.shortcuts.action.diagnoseQuery.description": "EXPLAIN für die aktuelle SQL ausführen und Ausführungsplan mit Indexvorschlägen anzeigen",
+  "app.shortcuts.action.diagnoseQuery.label": "SQL-Diagnose",
+  "app.shortcuts.action.showSlowQueries.description": "Verlauf langsamer SQL-Abfragen für die aktuelle Verbindung anzeigen (Standard-Schwellwert 500ms)",
+  "app.shortcuts.action.showSlowQueries.label": "Langsame SQL-Historie",
   "app.shortcuts.capture_hint": "Drücken Sie das Tastenkürzel, nachdem Sie auf \"Aufzeichnen\" geklickt haben. Mit Esc brechen Sie die Aufzeichnung ab. Globale Tastenkürzel sollten eine Modifikatortaste enthalten; AI-Chat-Senden unterstützt nur Enter-Kombinationen, Shift+Enter bleibt ein Zeilenumbruch.",
   "app.shortcuts.capture_waiting": "Tastenkürzel drücken...",
   "app.shortcuts.context.datagrid": "Datentabelle",

shared/i18n/en-US.json

@@ -386,6 +386,10 @@
   "app.shortcuts.action.toggleMacFullscreen.label": "Toggle Native Fullscreen",
   "app.shortcuts.action.toggleTheme.description": "Switch between light and dark themes",
   "app.shortcuts.action.toggleTheme.label": "Toggle Theme",
+  "app.shortcuts.action.diagnoseQuery.description": "Run EXPLAIN on the current SQL and visualize the execution plan with index suggestions",
+  "app.shortcuts.action.diagnoseQuery.label": "SQL Diagnose",
+  "app.shortcuts.action.showSlowQueries.description": "View slow SQL history for the current connection (default threshold 500ms)",
+  "app.shortcuts.action.showSlowQueries.label": "Slow SQL History",
   "app.shortcuts.capture_hint": "Press the shortcut after clicking \"Record\". Press Esc to cancel recording. Global shortcuts should include a modifier; AI chat send only supports Enter-related combinations, and Shift+Enter keeps inserting a new line.",
   "app.shortcuts.capture_waiting": "Press a shortcut...",
   "app.shortcuts.context.datagrid": "Data Grid",

shared/i18n/ja-JP.json

@@ -386,6 +386,10 @@
   "app.shortcuts.action.toggleMacFullscreen.label": "ネイティブフルスクリーン切り替え",
   "app.shortcuts.action.toggleTheme.description": "ライトテーマとダークテーマを切り替えます",
   "app.shortcuts.action.toggleTheme.label": "テーマを切り替え",
+  "app.shortcuts.action.diagnoseQuery.description": "現在の SQL に対して EXPLAIN を実行し、実行計画図とインデックス提案を表示します",
+  "app.shortcuts.action.diagnoseQuery.label": "SQL 診断",
+  "app.shortcuts.action.showSlowQueries.description": "現在の接続のスロー SQL 履歴を表示（デフォルト閾値 500ms）",
+  "app.shortcuts.action.showSlowQueries.label": "スロー SQL 履歴",
   "app.shortcuts.capture_hint": "「記録」をクリックした後にショートカットを押してください。Esc で記録をキャンセルできます。グローバルショートカットには修飾キーを含めることを推奨します。AI チャット送信は Enter 関連の組み合わせのみ対応し、Shift+Enter は改行のままです。",
   "app.shortcuts.capture_waiting": "ショートカットを押してください...",
   "app.shortcuts.context.datagrid": "データグリッド",

shared/i18n/ru-RU.json

@@ -386,6 +386,10 @@
   "app.shortcuts.action.toggleMacFullscreen.label": "Переключить нативный полноэкранный режим",
   "app.shortcuts.action.toggleTheme.description": "Переключение между светлой и темной темами",
   "app.shortcuts.action.toggleTheme.label": "Переключить тему",
+  "app.shortcuts.action.diagnoseQuery.description": "Выполнить EXPLAIN для текущего SQL и показать план выполнения с предложениями индексов",
+  "app.shortcuts.action.diagnoseQuery.label": "SQL-диагностика",
+  "app.shortcuts.action.showSlowQueries.description": "Просмотр истории медленных SQL-запросов для текущего подключения (порог по умолчанию 500мс)",
+  "app.shortcuts.action.showSlowQueries.label": "История медленных SQL",
   "app.shortcuts.capture_hint": "Нажмите сочетание клавиш после нажатия \"Записать\". Нажмите Esc, чтобы отменить запись. Для глобальных горячих клавиш рекомендуется модификатор; отправка AI-чата поддерживает только комбинации с Enter, а Shift+Enter сохраняет перенос строки.",
   "app.shortcuts.capture_waiting": "Нажмите сочетание клавиш...",
   "app.shortcuts.context.datagrid": "Таблица данных",

shared/i18n/zh-CN.json

@@ -386,6 +386,10 @@
   "app.shortcuts.action.toggleMacFullscreen.label": "切换原生全屏",
   "app.shortcuts.action.toggleTheme.description": "在亮色和暗色主题之间切换",
   "app.shortcuts.action.toggleTheme.label": "切换主题",
+  "app.shortcuts.action.diagnoseQuery.description": "对当前 SQL 执行 EXPLAIN 并展示执行计划图与索引建议",
+  "app.shortcuts.action.diagnoseQuery.label": "SQL 诊断",
+  "app.shortcuts.action.showSlowQueries.description": "查看当前连接的慢 SQL 历史记录（默认阈值 500ms）",
+  "app.shortcuts.action.showSlowQueries.label": "慢 SQL 历史",
   "app.shortcuts.capture_hint": "点击“录制”后按下快捷键。按 Esc 可取消录制。全局快捷键建议包含修饰键；AI 聊天发送仅支持 Enter 相关组合，Shift+Enter 保留换行。",
   "app.shortcuts.capture_waiting": "请按下快捷键...",
   "app.shortcuts.context.datagrid": "数据表格",

shared/i18n/zh-TW.json

@@ -386,6 +386,10 @@
   "app.shortcuts.action.toggleMacFullscreen.label": "切換原生全螢幕",
   "app.shortcuts.action.toggleTheme.description": "在淺色與深色主題之間切換",
   "app.shortcuts.action.toggleTheme.label": "切換主題",
+  "app.shortcuts.action.diagnoseQuery.description": "對目前 SQL 執行 EXPLAIN 並顯示執行計劃圖與索引建議",
+  "app.shortcuts.action.diagnoseQuery.label": "SQL 診斷",
+  "app.shortcuts.action.showSlowQueries.description": "檢視目前連線的慢 SQL 歷史記錄（預設閾值 500ms）",
+  "app.shortcuts.action.showSlowQueries.label": "慢 SQL 歷史",
   "app.shortcuts.capture_hint": "點擊「錄製」後按下快捷鍵。按 Esc 可取消錄製。全域快捷鍵建議包含修飾鍵；AI 聊天傳送僅支援 Enter 相關組合，Shift+Enter 保留換行。",
   "app.shortcuts.capture_waiting": "請按下快捷鍵...",
   "app.shortcuts.context.datagrid": "資料表格",