✨ feat(kafka): 新增 Kafka 数据源连接支持

Refs #387

frontend/src/utils/objectQueryTemplates.test.ts

@@ -6,4 +6,8 @@ describe('buildTableSelectQuery', () => {
   it('quotes uppercase postgres table names in new query templates', () => {
     expect(buildTableSelectQuery('postgres', 'public.MyTable')).toBe('SELECT * FROM public."MyTable";');
   });
+
+  it('adds a preview limit for Kafka topic browsing', () => {
+    expect(buildTableSelectQuery('kafka', 'logs.app-1')).toBe('SELECT * FROM "logs.app-1" LIMIT 100;');
+  });
 });