Implement complete multi-language support with Romanian/English

- Added next-intl for internationalization with Romanian as default locale
- Restructured app directory with [locale] routing (/ro, /en)
- Created comprehensive translation files for both languages
- Fixed Next.js 15 async params compatibility in layout components
- Updated all components to use proper i18n hooks and translations
- Configured middleware for locale routing and fallbacks
- Fixed FloatingChat component translation array handling
- Restored complete home page with internationalized content
- Fixed Material-UI Slide component prop error (mountOnExit → unmountOnExit)

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

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

i18n.ts

@@ -0,0 +1,14 @@
+import {getRequestConfig} from 'next-intl/server';
+
+// Can be imported from a shared config
+export const locales = ['ro', 'en'];
+
+export default getRequestConfig(async ({locale}) => {
+  // Ensure locale has a value, default to 'ro' if undefined
+  const validLocale = locale || 'ro';
+
+  return {
+    locale: validLocale,
+    messages: (await import(`./messages/${validLocale}.json`)).default
+  };
+});