优化：文件服务器安全重构+编辑器增强+搜索排序+更新面板Markdown渲染

- 路径校验提取validateFilePath+sentinel error替代字符串匹配
- requireUpdateAPI收敛7处重复nil检查
- 端口18765统一为8073，消除分散魔法数字
- CodeMirror添加搜索功能+滚动位置LRU缓存恢复
- 文件列表新增列排序+搜索过滤
- Toolbar重排：快捷访问内嵌+搜索框集成+历史改图标
- 重命名零闪烁：updateFilePath草稿迁移
- changelog用marked渲染+sanitizeHtml防XSS
- MigrateTabConfig扩展map驱动覆盖openclaw-manager→version迁移

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/service/config_service.go

@@ -44,9 +44,9 @@ var defaultTabConfig = TabConfig{
 		{Key: "file-system", Title: "文件管理", Enabled: true},
 		{Key: "db-cli", Title: "数据库", Enabled: true},
 		{Key: "markdown-editor", Title: "Markdown", Enabled: true},
-		{Key: "openclaw-manager", Title: "OpenClaw", Enabled: true},
+		{Key: "version", Title: "版本历史", Enabled: true},
 	},
-	VisibleTabs: []string{"file-system", "db-cli", "markdown-editor", "openclaw-manager"},
+	VisibleTabs: []string{"file-system", "db-cli", "markdown-editor", "version"},
 	DefaultTab:  "file-system",
 }