🐛 fix(driver-manager/mongodb): 恢复旧版 MongoDB 连接兼容

- 默认版本：将 MongoDB 推荐 driver-agent 切到 1.17.9
- 安装策略：v1 兼容驱动优先尝试发布资产，不再强制源码构建
- 状态提示：已安装 2.x 时提示重装以兼容 MongoDB 4.0
- 前端交互：重装驱动优先选择推荐兼容版本
- 测试覆盖：补充版本选择、下载候选和重装传参回归

frontend/src/components/DriverManagerModal.test.tsx

@@ -230,4 +230,62 @@ describe('DriverManagerModal toolbar actions', () => {
       vi.useRealTimers();
     }
   });
+
+  it('reinstalls stale MongoDB v2 drivers with the v1 compatibility default', async () => {
+    vi.useFakeTimers({ shouldAdvanceTime: true });
+    try {
+      vi.setSystemTime(new Date(Date.now() + 2 * 60 * 1000));
+      backendApp.GetDriverStatusList.mockResolvedValue({
+        success: true,
+        data: {
+          downloadDir: 'D:/drivers',
+          drivers: [
+            {
+              type: 'mongodb',
+              name: 'MongoDB',
+              builtIn: false,
+              pinnedVersion: '1.17.9',
+              installedVersion: '2.5.0',
+              runtimeAvailable: true,
+              packageInstalled: true,
+              connectable: true,
+              needsUpdate: true,
+              defaultDownloadUrl: 'builtin://activate/mongodb',
+              message: '建议重装',
+            },
+          ],
+        },
+      });
+      backendApp.GetDriverVersionList.mockResolvedValue({
+        success: true,
+        data: {
+          versions: [
+            { version: '2.5.0', downloadUrl: 'builtin://activate/mongodb?version=2.5.0' },
+            { version: '1.17.9', downloadUrl: 'builtin://activate/mongodb', recommended: true },
+          ],
+        },
+      });
+      backendApp.DownloadDriverPackage.mockResolvedValue({ success: true });
+
+      let renderer: ReactTestRenderer;
+      await act(async () => {
+        renderer = create(<DriverManagerModal open onClose={vi.fn()} />);
+      });
+      await flushPromises();
+
+      const reinstallButton = findButton(renderer!, '重装驱动');
+      await act(async () => {
+        await reinstallButton.props.onClick();
+      });
+
+      expect(backendApp.DownloadDriverPackage).toHaveBeenCalledWith(
+        'mongodb',
+        '1.17.9',
+        'builtin://activate/mongodb',
+        'D:/drivers',
+      );
+    } finally {
+      vi.useRealTimers();
+    }
+  });
 });

frontend/src/components/DriverManagerModal.tsx

@@ -525,6 +525,8 @@ const DriverManagerModal: React.FC<{ open: boolean; onClose: () => void; onOpenG
           return prev;
         }
         const preferred =
+          (row.needsUpdate ? options.find((option) => option.version === row.pinnedVersion) : undefined) ||
+          (row.needsUpdate ? options.find((option) => option.recommended) : undefined) ||
           options.find((option) => option.version === row.installedVersion) ||
           options.find((option) => option.version === row.pinnedVersion) ||
           options.find((option) => option.recommended) ||
@@ -712,6 +714,8 @@ const DriverManagerModal: React.FC<{ open: boolean; onClose: () => void; onOpenG
       }
       const selectedKey = selectedVersionMap[row.type];
       const selectedOption =
+        (row.needsUpdate ? versionOptions.find((item) => item.version === row.pinnedVersion) : undefined) ||
+        (row.needsUpdate ? versionOptions.find((item) => item.recommended) : undefined) ||
         versionOptions.find((item) => buildVersionOptionKey(item) === selectedKey) ||
         versionOptions.find((item) => item.recommended) ||
         versionOptions[0];
@@ -1033,7 +1037,7 @@ const DriverManagerModal: React.FC<{ open: boolean; onClose: () => void; onOpenG
     const selectedKey = selectedVersionMap[row.type];
     const selectOptions = buildVersionSelectOptions(options);
     const mongoHint = row.type === 'mongodb'
-      ? '当前仅支持 MongoDB 1.17.x 和 2.x；更老 1.x 暂不提供安装。'
+      ? 'MongoDB 4.0 请使用 1.17.x 兼容驱动；2.x 驱动要求 MongoDB 4.2+。'
       : '';
     return (
       <div className="driver-manager-version-control">