chore: 取消跟踪 local-l13-start.sh(本地联调脚本,含 throwaway 值,不入 git)+ gitignore

误由 Task5 fix 的 git add 扫入,回退。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013nMthbVEmQquxBRKb9Fj8u

.gitignore

@@ -90,3 +90,4 @@ client/windows/installer/Output/
 /server/cover.out
 /server/coverage.txt
 /client/coverage/
+local-l13-start.sh