feat: add Jinshuju student sync

apps/server/src/sync/sync.controller.spec.ts

@@ -43,4 +43,23 @@ describe('SyncController — schedule sync options', () => {
 
     expect(syncService.triggerSync).toHaveBeenCalledWith('dingtalk_students', 12);
   });
+
+  it('returns Jinshuju form fields for the selector', async () => {
+    const syncService = {
+      getJinshujuFormFields: jest.fn().mockResolvedValue({
+        name: '报名表',
+        fields: [{ key: 'field_1', label: '姓名', type: 'single_line_text' }],
+      }),
+    };
+    const controller = new SyncController(syncService as never);
+
+    const result = await controller.getJinshujuFields({
+      apiKey: 'key',
+      apiSecret: 'secret',
+      formToken: 'form-a',
+    });
+
+    expect(syncService.getJinshujuFormFields).toHaveBeenCalledWith('key', 'secret', 'form-a');
+    expect(result.data.fields[0]).toMatchObject({ key: 'field_1', label: '姓名' });
+  });
 });