Add admin event actions (online/offline, edit, delete) and fix Meilisearch depends_on

- Add toggle online/offline and delete routes in AdminController
- Add action buttons (En ligne, Modifier, Supprimer) in admin events template
- Bypass requireEventOwnership and requireStripeReady for ROLE_ROOT so admin can edit any event
- Add Meilisearch healthcheck and depends_on in messenger service (prod + dev)
- Add tests for all new admin routes and ROLE_ROOT bypass

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

docker-compose-dev.yml

@@ -71,6 +71,8 @@ services:
         condition: service_healthy
       redis:
         condition: service_healthy
+      meilisearch:
+        condition: service_healthy
 
   bun:
     image: oven/bun:alpine
@@ -135,6 +137,11 @@ services:
       - "7700:7700"
     volumes:
       - meilisearch-data:/meili_data
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:7700/health"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
 
   libretranslate:
     image: libretranslate/libretranslate:latest