✨ feat(export-workbench): 支持批量导出工作台并优化 SQL 导出性能

- 侧边栏批量表/批量库入口改为直接打开导出工作台，统一导出配置与进度视图
- 导出工作台新增 batch-tables / batch-databases 模式，支持连接、数据库、对象选择与独立历史记录键
- 连接、数据库、对象下拉项补齐完整名展示与悬浮提示，避免长名称被截断后不可识别
- 后端新增批量对象/批量库导出 WithOptions 链路，统一返回输出文件/目录与进度信息
- SQL dump 数据导出改为按方言批量写入，MySQL/PG 等使用多值 VALUES，Oracle/达梦使用 INSERT ALL
- 补充导出工作台与 SQL dump 的回归测试和 benchmark，覆盖批量模式与批量写入语义

frontend/src/utils/tableExportTab.test.ts

@@ -1,6 +1,9 @@
 import { describe, expect, it } from 'vitest';
 
 import {
+  buildBatchDatabaseExportWorkbenchTab,
+  buildBatchTableExportWorkbenchTab,
+  buildExportWorkbenchHistoryKey,
   buildTableExportHistoryKey,
   buildTableExportTab,
   DEFAULT_TABLE_EXPORT_SCOPE_OPTION,
@@ -11,6 +14,20 @@ describe('tableExportTab', () => {
     expect(buildTableExportHistoryKey(' conn-1 ', ' app ', ' public.orders ')).toBe('conn-1::app::public.orders');
   });
 
+  it('builds batch workbench history keys by mode', () => {
+    expect(buildExportWorkbenchHistoryKey({
+      connectionId: ' conn-1 ',
+      dbName: ' app ',
+      tableName: 'orders',
+      exportWorkbenchMode: 'batch-tables',
+    })).toBe('conn-1::app::__batch_tables__');
+    expect(buildExportWorkbenchHistoryKey({
+      connectionId: ' conn-1 ',
+      dbName: ' ignored ',
+      exportWorkbenchMode: 'batch-databases',
+    })).toBe('conn-1::__batch_databases__');
+  });
+
   it('builds a stable table export tab with normalized defaults', () => {
     const tab = buildTableExportTab({
       connectionId: 'conn-1',
@@ -21,6 +38,7 @@ describe('tableExportTab', () => {
     expect(tab.id).toBe('table-export-conn-1-app-public.orders');
     expect(tab.type).toBe('table-export');
     expect(tab.title).toBe('导出 public.orders');
+    expect(tab.exportWorkbenchMode).toBe('single');
     expect(tab.tableExportScopeOptions).toEqual([DEFAULT_TABLE_EXPORT_SCOPE_OPTION]);
     expect(tab.tableExportInitialScope).toBe('all');
     expect(tab.tableExportQueryByScope).toBeUndefined();
@@ -60,4 +78,28 @@ describe('tableExportTab', () => {
       filteredAll: 42,
     });
   });
+
+  it('builds batch table export workbench tabs with stable ids', () => {
+    const tab = buildBatchTableExportWorkbenchTab({
+      connectionId: 'conn-1',
+      dbName: 'SYS',
+    });
+
+    expect(tab.id).toBe('table-export-batch-tables-conn-1-SYS');
+    expect(tab.type).toBe('table-export');
+    expect(tab.title).toBe('批量导出对象');
+    expect(tab.exportWorkbenchMode).toBe('batch-tables');
+    expect(tab.dbName).toBe('SYS');
+  });
+
+  it('builds batch database export workbench tabs with stable ids', () => {
+    const tab = buildBatchDatabaseExportWorkbenchTab({
+      connectionId: 'conn-1',
+    });
+
+    expect(tab.id).toBe('table-export-batch-databases-conn-1');
+    expect(tab.type).toBe('table-export');
+    expect(tab.title).toBe('批量导出库');
+    expect(tab.exportWorkbenchMode).toBe('batch-databases');
+  });
 });