🐛 fix(driver): 修复驱动代理校验与 DuckDB 表预览超时

- 校验可选 driver-agent revision，避免重装后复用旧代理
- DuckDB 表预览默认不再追加兜底 ORDER BY
- 优化 DuckDB 超时中断提示并补充回归测试

frontend/src/utils/sql.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from 'vitest';
+
+import { buildOrderBySQL } from './sql';
+
+describe('buildOrderBySQL', () => {
+  it('does not add fallback ORDER BY for DuckDB without explicit sort', () => {
+    expect(buildOrderBySQL('duckdb', [], ['ID'])).toBe('');
+  });
+
+  it('keeps explicit DuckDB sort', () => {
+    expect(buildOrderBySQL('duckdb', { columnKey: 'ID', order: 'descend' }, ['NAME'])).toBe(' ORDER BY "ID" DESC');
+  });
+});