feat: initialisation complète du projet CESIZen

- Backend Laravel 11 (API REST, JWT auth, PostgreSQL)
- Frontend Next.js 14 (React, TypeScript, Tailwind CSS)
- Docker Compose (PostgreSQL, backend, frontend)
- Modules : auth, profil, tracker émotions, informations, admin

backend/.gitattributes

@@ -0,0 +1,11 @@
+* text=auto eol=lf
+
+*.blade.php diff=html
+*.css diff=css
+*.html diff=html
+*.md diff=markdown
+*.php diff=php
+
+/.github export-ignore
+CHANGELOG.md export-ignore
+.styleci.yml export-ignore