feat(qmt): 优化定时重连机制避免与健康检查冲突

- 添加 is_scheduled_reconnecting 标志位协调重连逻辑
- 增强定时重连任务的日志前缀便于追踪
- 改进异常处理和资源清理日志
- 优化代码格式和注释

predictions_test.tsv

@@ -1483,3 +1483,23 @@ trade_date,score,ts_code
 2026-01-22,0.5392295112943043,002193.SZ
 2026-01-23,0.4433520823626358,001211.SZ
 2026-01-23,0.5104712391758388,002193.SZ
+2026-01-26,0.44845793700606645,600768.SH
+2026-01-26,0.5184014597753998,002193.SZ
+2026-01-27,0.38801810040527523,002719.SZ
+2026-01-27,0.4660343777911184,002193.SZ
+2026-01-28,0.3752951609014855,002963.SZ
+2026-01-28,0.3844631540327193,002193.SZ
+2026-01-29,0.3957310272373612,002188.SZ
+2026-01-29,0.4154973074156361,002193.SZ
+2026-01-30,0.4406255680708698,002193.SZ
+2026-01-30,0.6387329035097701,600768.SH
+2026-02-02,0.46452469502542476,600543.SH
+2026-02-02,0.48096075649083675,002719.SZ
+2026-02-03,0.4682296506349894,002719.SZ
+2026-02-03,0.6074115272186936,002193.SZ
+2026-02-04,0.441433034204454,600847.SH
+2026-02-04,0.6491590676980965,002193.SZ
+2026-02-05,0.43576482005305384,002719.SZ
+2026-02-05,0.6383257473564533,002193.SZ
+2026-02-06,0.45969830258066396,600493.SH
+2026-02-06,0.6311025962732058,002193.SZ