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/utils/api.ts

@@ -0,0 +1,10 @@
+export type HydraCollection<T> = {
+    'hydra:member'?: T[]
+    'hydra:totalItems'?: number
+    'member'?: T[]
+    'totalItems'?: number
+}
+
+export function extractHydraMembers<T>(response: HydraCollection<T>): T[] {
+    return response['hydra:member'] ?? response['member'] ?? []
+}