Fix health check: use node instead of wget (not available in Alpine image)

Also increase start_period to 60s to allow time for migrations on first boot.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker/docker-compose.yml

@@ -50,11 +50,11 @@ services:
     networks:
       - mopc-network
     healthcheck:
-      test: ["CMD", "wget", "-q", "--spider", "http://localhost:7600/api/health"]
+      test: ["CMD", "node", "-e", "fetch('http://localhost:7600/api/health').then(r=>{if(!r.ok)throw r;process.exit(0)}).catch(()=>process.exit(1))"]
       interval: 30s
       timeout: 10s
       retries: 3
-      start_period: 40s
+      start_period: 60s
 
   postgres:
     image: postgres:16-alpine