技能展示配置持久化并适配引用来源,新增技能文件预览组件

- 后端将技能展示适配配置存入数据库,引用批次按持久化映射进行适配
- 前端新增技能文件预览弹窗与文件树组件,完善技能来源展示
- 修正 .gitignore 中宽泛的 skills/ 规则误忽略前端组件目录的问题

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -5,10 +5,10 @@ frontend-web/.vscode/
 # Claude Code local-only settings (per-user permissions, not shared)
 .claude/settings.local.json
 
-# Local runtime logs and pid files
-.runtime/
-logs/
-offline-backend-20260512/backend/logs/
+# Local runtime logs and pid files
+.runtime/
+logs/
+offline-backend-20260512/backend/logs/
 
 # Frontend local/runtime artifacts
 frontend-web/.env
@@ -83,3 +83,6 @@ hermes-agent-main/
 offline-backend-20260512/backend/tests/*
 deploy
 .history
+
+# Frontend skills components must be tracked (excluded from the broad skills/ ignore above)
+!frontend-web/src/components/workspace/skills/