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/issue/hub/IssueHubTabs.tsx

@@ -8,7 +8,7 @@ import { Button } from '@/components/ui/Button';
 import { cn } from '@/lib/utils';
 
 // Keep in sync with IssueHubHeader/IssueHubPage
-export type IssueTab = 'issues' | 'board' | 'queue' | 'discovery' | 'observability' | 'executions';
+export type IssueTab = 'issues' | 'board' | 'queue' | 'discovery' | 'executions';
 
 interface IssueHubTabsProps {
   currentTab: IssueTab;
@@ -23,7 +23,6 @@ export function IssueHubTabs({ currentTab, onTabChange }: IssueHubTabsProps) {
     { value: 'board', label: formatMessage({ id: 'issues.hub.tabs.board' }) },
     { value: 'queue', label: formatMessage({ id: 'issues.hub.tabs.queue' }) },
     { value: 'discovery', label: formatMessage({ id: 'issues.hub.tabs.discovery' }) },
-    { value: 'observability', label: formatMessage({ id: 'issues.hub.tabs.observability' }) },
     { value: 'executions', label: formatMessage({ id: 'issues.hub.tabs.executions' }) },
   ];