feat : init Central project — Symfony 8 + Nuxt 4 + Docker starter

Same architecture as Lesstime: API Platform 4, JWT auth, @malio/layer-ui,
PostgreSQL 16, Docker Compose (ports 8083/3003/5436), dark mode theme.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.env

@@ -0,0 +1,23 @@
+APP_ENV=dev
+APP_SECRET="change_me_in_env_local"
+APP_DEBUG=1
+
+DEFAULT_URI=http://localhost/
+
+###> nelmio/cors-bundle ###
+CORS_ALLOW_ORIGIN='^https?://(localhost|127.0.0.1)(:[0-9]+)?$'
+###< nelmio/cors-bundle ###
+
+###> lexik/jwt-authentication-bundle ###
+JWT_SECRET_KEY=%kernel.project_dir%/config/jwt/private.pem
+JWT_PUBLIC_KEY=%kernel.project_dir%/config/jwt/public.pem
+JWT_PASSPHRASE=change_me_in_env_local
+JWT_COOKIE_SECURE=0
+JWT_TOKEN_TTL=86400
+JWT_COOKIE_TTL=86400
+###< lexik/jwt-authentication-bundle ###
+
+
+DATABASE_URL="postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:${POSTGRES_PORT}/${POSTGRES_DB}?serverVersion=16&charset=utf8"
+
+ENCRYPTION_KEY=change_me_in_env_local