feat(i18n): add navigation utilities for internationalization

- Create navigation.ts with i18n-aware routing configuration
- Export localized Link, redirect, usePathname, useRouter, and getPathname
- Configure locale prefix as 'as-needed' for cleaner URLs
- Leverage next-intl/navigation for automatic locale handling

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ericyangpan

src/i18n/navigation.ts

@@ -0,0 +1,14 @@
+import { createNavigation } from 'next-intl/navigation';
+import { defineRouting } from 'next-intl/routing';
+import { locales, defaultLocale } from './config';
+
+export const routing = defineRouting({
+  locales,
+  defaultLocale,
+  localePrefix: 'as-needed',
+});
+
+// Create localized versions of Link, redirect, usePathname, useRouter, getPathname
+// These will automatically handle locale prefixes based on the current locale
+export const { Link, redirect, usePathname, useRouter, getPathname } =
+  createNavigation(routing);