feat: add CLI config preview API for Codex and Gemini

- Implemented `fetchCodexConfigPreview` and `fetchGeminiConfigPreview` functions in the API layer to retrieve masked configuration files.
- Added new interfaces `CodexConfigPreviewResponse` and `GeminiConfigPreviewResponse` to define the structure of the API responses.
- Created utility functions to read and mask sensitive values from `config.toml` and `auth.json` for Codex, and `settings.json` for Gemini.
- Updated CLI settings routes to handle new preview endpoints.
- Enhanced session content parser to support Claude JSONL format.
- Updated UI components to reflect changes in history page and navigation, including new tabs for observability.
- Localized changes for English and Chinese languages to reflect "CLI History" terminology.

ccw/frontend/src/components/layout/Sidebar.tsx

@@ -17,7 +17,6 @@ import {
   PanelLeftClose,
   PanelLeftOpen,
   LayoutDashboard,
-  Clock,
   Zap,
   GitFork,
   Shield,
@@ -78,7 +77,6 @@ const navGroupDefinitions: NavGroupDef[] = [
       { path: '/sessions', labelKey: 'navigation.main.sessions', icon: FolderKanban },
       { path: '/lite-tasks', labelKey: 'navigation.main.liteTasks', icon: Zap },
       { path: '/orchestrator', labelKey: 'navigation.main.orchestrator', icon: Workflow },
-      { path: '/history', labelKey: 'navigation.main.history', icon: Clock },
       { path: '/issues', labelKey: 'navigation.main.issues', icon: AlertCircle },
       { path: '/teams', labelKey: 'navigation.main.teams', icon: Users },
       { path: '/terminal-dashboard', labelKey: 'navigation.main.terminalDashboard', icon: Terminal },