用户中心侧栏工单中心图标改用 comment-color

- sidebar-nav: 工单中心 icon ticket-color -> comment-color
- 删除 assets/icons/sprite/ticket-color.svg 并重建 svg-icon.js
- 同步更新相关契约测试

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/icons/sprite/ticket-color.svg

@@ -1 +0,0 @@
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