feat(i18n): integrate internationalization into sidebar, title bar, and settings components

- Added useI18n hook to Sidebar and TitleBar components for translation support.
- Updated sidebar navigation items to use translation keys instead of hardcoded labels.
- Enhanced TitleBar buttons with localized titles for minimize, maximize, and close actions.
- Expanded i18n constants to include new namespaces for sidebar and login.
- Implemented translation messages for sidebar, settings, and login components in English, Chinese, and Japanese.
- Refactored Knowledge and Skills pages to utilize useLocale for locale management.
- Updated Login page to display localized text for form labels, placeholders, and error messages.
- Enhanced Account and General settings panels with localized titles and descriptions.
- Modified SettingMenu to use translation keys for menu items.

src/App.tsx

@@ -1,9 +1,12 @@
 import { useEffect } from 'react';
 import { HashRouter } from 'react-router-dom';
+import { useLocale } from './i18n';
 import { AppRouter } from './router';
 import { initSettingsStore } from './stores';
 
 export default function App() {
+  useLocale();
+
   useEffect(() => {
     void initSettingsStore();
   }, []);