feat(i18n): add multi-language UI support with 5 languages

- Add i18n framework with locale detection and cookie persistence
- Support English, Traditional Chinese (zh-TW), Simplified Chinese (zh-CN), Japanese (ja), Korean (ko)
- Add LanguageSelector component in navigation header
- Create locale JSON files with full translations
- Update all page components (root, user, results, history) with i18n support
- Add client-side translation helpers for dynamic content
- Auto-detect user's preferred language from browser settings
- Bump version to v0.1.3

tsconfig.json

@@ -29,6 +29,6 @@
     "esModuleInterop": true
     // "noImplicitReturns": true
   },
-  "include": ["src", "package.json"],
+  "include": ["src", "src/locales/*.json", "package.json"],
   "exclude": ["dist", "node_modules"]
 }