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>

config/routes/api_platform.yaml

@@ -0,0 +1,4 @@
+api_platform:
+    resource: .
+    type: api_platform
+    prefix: /api

config/routes/security.yaml

@@ -0,0 +1,7 @@
+_security_logout:
+    resource: security.route_loader.logout
+    type: service
+
+api_login:
+    path: /login_check
+    methods: [POST]