feat(i18n): Enhance internationalization with dynamic locale management

- Add comprehensive locale management with `useLocale` composable
- Implement dynamic locale loading and persistent storage
- Create type-safe internationalization infrastructure
- Add flag emojis and locale selection utilities
- Expand English locale with more comprehensive message schemas

src/i18n/types.ts

@@ -0,0 +1,53 @@
+export interface LocaleMessages {
+  nav: {
+    title: string
+    home: string
+    directory: string
+    faq: string
+    support: string
+    login: string
+    logout: string
+  }
+  // Add more message categories here
+  common: {
+    loading: string
+    error: string
+    success: string
+  }
+  errors: {
+    notFound: string
+    serverError: string
+    networkError: string
+  }
+  // Add date/time formats
+  dateTimeFormats: {
+    short: {
+      year: 'numeric'
+      month: 'short'
+      day: 'numeric'
+    }
+    long: {
+      year: 'numeric'
+      month: 'long'
+      day: 'numeric'
+      weekday: 'long'
+      hour: 'numeric'
+      minute: 'numeric'
+    }
+  }
+  // Add number formats
+  numberFormats: {
+    currency: {
+      style: 'currency'
+      currencyDisplay: 'symbol'
+    }
+    decimal: {
+      style: 'decimal'
+      minimumFractionDigits: 2
+    }
+    percent: {
+      style: 'percent'
+      useGrouping: false
+    }
+  }
+}