🐛 fix(driver): 明确JDBC Jar导入限制并补充Kingbase指引

- 后端在驱动包选择与本地导入前拦截 JDBC Jar，并返回替代说明
- 驱动管理统一改为“导入驱动包”，补充不支持 JDBC Jar 的提示
- 自定义连接补充 kingbase8 等驱动别名与 Go 驱动说明
- 新增后端与前端回归测试

Refs #317

frontend/src/utils/driverImportGuidance.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'vitest';
+
+import {
+  CUSTOM_CONNECTION_DRIVER_HELP,
+  DRIVER_LOCAL_IMPORT_BUTTON_LABEL,
+  DRIVER_LOCAL_IMPORT_DIRECTORY_HELP,
+  DRIVER_LOCAL_IMPORT_SINGLE_FILE_HELP,
+} from './driverImportGuidance';
+
+describe('driver import guidance', () => {
+  it('keeps local import copy focused on driver packages instead of JDBC jars', () => {
+    expect(DRIVER_LOCAL_IMPORT_BUTTON_LABEL).toBe('导入驱动包');
+    expect(DRIVER_LOCAL_IMPORT_DIRECTORY_HELP).toContain('导入驱动目录');
+    expect(DRIVER_LOCAL_IMPORT_SINGLE_FILE_HELP).toContain('JDBC Jar');
+  });
+
+  it('documents custom driver aliases for kingbase and related fallbacks', () => {
+    expect(CUSTOM_CONNECTION_DRIVER_HELP).toContain('kingbase8');
+    expect(CUSTOM_CONNECTION_DRIVER_HELP).toContain('pgx');
+    expect(CUSTOM_CONNECTION_DRIVER_HELP).toContain('JDBC Jar');
+  });
+});

frontend/src/utils/driverImportGuidance.ts

@@ -0,0 +1,10 @@
+export const DRIVER_LOCAL_IMPORT_BUTTON_LABEL = '导入驱动包';
+
+export const DRIVER_LOCAL_IMPORT_DIRECTORY_HELP =
+  '如果应用内下载链路失败，可先手动下载驱动包到该目录，再使用“导入驱动包”或“导入驱动目录”完成安装。';
+
+export const DRIVER_LOCAL_IMPORT_SINGLE_FILE_HELP =
+  '行内“导入驱动包”仅用于单个驱动文件/总包（如 `mariadb-driver-agent`、`mariadb-driver-agent.exe`、`GoNavi-DriverAgents.zip`），不支持直接导入 JDBC Jar；批量导入请使用上方“导入驱动目录”。';
+
+export const CUSTOM_CONNECTION_DRIVER_HELP =
+  '已支持: mysql, postgres, sqlite, oracle, dm, kingbase；别名支持 postgresql/pgx、dm8、kingbase8/kingbasees/kingbasev8。当前不支持通过 JDBC Jar 扩展驱动。';