fix: newer lane rules take precedence over older ones when priority is equal in TSF mode

[fuyuwei01]

问题描述

泳道路由在规则排序时，三级排序为：流量入口 → 优先级 → 创建时间。当前 ctime 比较使用升序，导致同优先级时旧规则优先匹配。

在 TSF 场景下，期望行为是新规则优先（即后创建的规则覆盖旧规则）。

修改内容

在 LaneRuleContainer 构造函数中，排序前先检测当前 groups 是否为 TSF 模式（通过 group.getName() == "tsf" 判断，与 LaneRouter#checkServiceInLane 的判断逻辑一致）：

• TSF 场景：ctime 降序 → 新规则优先
• 非 TSF 场景：ctime 升序 → 旧规则优先（维持原有行为）

变更文件

• polaris-plugins/polaris-plugins-router/router-lane/src/main/java/com/tencent/polaris/plugins/router/lane/LaneRuleContainer.java

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 21.58%. Comparing base (b3df955) to head (8418ed9).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #711      +/-   ##
============================================
- Coverage     22.04%   21.58%   -0.46%     
- Complexity     1204     1215      +11     
============================================
  Files           413      417       +4     
  Lines         17191    17649     +458     
  Branches       2222     2280      +58     
============================================
+ Hits           3789     3810      +21     
- Misses        12973    13407     +434     
- Partials        429      432       +3     

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