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>

package.json

@@ -24,6 +24,7 @@
   "dependencies": {
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.1",
+    "@formatjs/intl-localematcher": "^0.6.1",
     "@mui/icons-material": "^7.3.2",
     "@mui/material": "^7.3.2",
     "@mui/material-nextjs": "^7.3.2",
@@ -46,7 +47,9 @@
     "clsx": "^2.1.1",
     "jsonwebtoken": "^9.0.2",
     "lucide-react": "^0.544.0",
+    "negotiator": "^1.0.0",
     "next": "^15.5.3",
+    "next-intl": "^4.3.9",
     "openai": "^5.22.0",
     "pdf-parse": "^1.1.1",
     "pg": "^8.16.3",