✨ feat(mqtt): 新增 MQTT 数据源连接与测试发消息支持

frontend/src/utils/objectQueryTemplates.test.ts

@@ -11,6 +11,10 @@ describe('buildTableSelectQuery', () => {
     expect(buildTableSelectQuery('kafka', 'logs.app-1')).toBe('SELECT * FROM "logs.app-1" LIMIT 100;');
   });
 
+  it('adds a preview limit for MQTT topic browsing', () => {
+    expect(buildTableSelectQuery('mqtt', 'devices/+/telemetry')).toBe('SELECT * FROM "devices/+/telemetry" LIMIT 100;');
+  });
+
   it('adds a preview limit for RabbitMQ queue browsing', () => {
     expect(buildTableSelectQuery('rabbitmq', 'orders.events.v1')).toBe('SELECT * FROM "orders.events.v1" LIMIT 100;');
   });