Add healthcheck to Vaultwarden (/alive)

Vaultwarden exposes /alive for liveness. wget --spider, 30s
interval, 30s start_period.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

security/vaultwarden/docker-compose.yml

@@ -24,6 +24,13 @@ services:
     security_opt:
       - no-new-privileges:true
 
+    healthcheck:
+      test: ["CMD-SHELL", "wget -q --spider http://localhost:80/alive || exit 1"]
+      interval: 30s
+      timeout: 5s
+      retries: 5
+      start_period: 30s
+
     labels:
       - traefik.enable=true
       - traefik.docker.network=frontend_net