✨ feat(skills): curate code workflow skills

Add a Gitea CI triage skill with legacy web-log fallback, document first-party and third-party skill roles, and register selected third-party code workflow sources.

Remove the first-party bulk refactor workflow in favor of the registered codebase migration replacement.

SKILLS.md

@@ -174,8 +174,8 @@ python <deploy_root>/scripts/playbook.py -config playbook.toml
 ### 通用工作流 Skills
 
 - `commit-message`：基于 staged diff 自动建议提交信息（`:emoji: type(scope): subject`）
+- `gitea-fix-ci`：诊断 Gitea Actions / PR checks 失败，先提取日志证据并形成修复计划，再按批准范围改代码
 - `style-cleanup`：整理代码风格（优先使用仓库既有 formatter/lint 工具链）
-- `bulk-refactor-workflow`：批量重构（安全做法 + 验证契约）
 
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