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>

frontend/app.vue

@@ -0,0 +1,13 @@
+<template>
+    <NuxtLayout>
+        <NuxtPage />
+    </NuxtLayout>
+</template>
+
+<script setup lang="ts">
+const { load } = useAppVersion()
+
+onMounted(() => {
+    load()
+})
+</script>