Phase 0 : scaffolding complet

- Structure monorepo (backend Symfony, frontend React/Vite)
- Docker : FrankenPHP + PostgreSQL/PostGIS + Redis + Traefik labels
- Caddyfile, Dockerfile, .env.example, .gitignore
- MapLibre GL JS + react-map-gl installés
- Roadmap mise à jour

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,28 @@
+# Environnement
+.env
+.env.local
+.env.*.local
+
+# Symfony
+backend/var/
+backend/vendor/
+backend/public/bundles/
+backend/.env.local
+backend/.env.test.local
+
+# React
+frontend/node_modules/
+frontend/dist/
+frontend/.env.local
+
+# Docker
+*.log
+
+# OS
+.DS_Store
+Thumbs.db
+
+# IDE
+.idea/
+.vscode/
+*.swp