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>

README.md

@@ -0,0 +1,18 @@
+# Central
+
+Application de gestion du SI Malio — gestion des applications, bases de données, mode maintenance, déploiements.
+
+## Installation
+
+```bash
+make start
+make install
+make fixtures
+```
+
+## Accès
+
+- Frontend : http://localhost:8083
+- API : http://localhost:8083/api
+- Dev Nuxt (hot reload) : http://localhost:3003
+- Login : `admin` / `admin`