feat: 实现Kafka批量消费与写入以提升吞吐量

引入批量处理机制，将消息缓冲并按批次写入数据库，显著提高消费性能。调整Kafka配置参数，优化消费者并发与提交策略。新增分区索引自动创建功能，并重构处理器以支持批量操作。添加降级写入逻辑以处理数据错误，同时增强指标收集以监控批量处理效果。

bls-onoffline-backend/tests/processor.test.js

@@ -16,7 +16,7 @@ describe('Processor Logic', () => {
 
   it('should validate required fields', () => {
     expect(() => buildRowsFromPayload({})).toThrow();
-    expect(() => buildRowsFromPayload({ ...basePayload, UnixTime: undefined })).toThrow();
+    expect(() => buildRowsFromPayload({ ...basePayload, HotelCode: undefined })).toThrow();
   });
 
   it('should use current_status from payload for non-reboot data', () => {