Fix S3/SMTP connectivity and add one-click invite flow

- Fix MinIO port parsing bug: use protocol-appropriate defaults (443/80)
  instead of hardcoded 9000 fallback, enabling public URL endpoint
- Remove unused SMTP server config from NextAuth EmailProvider to prevent
  connection errors (sendVerificationRequest is fully overridden)
- Replace extra_hosts with DNS config (8.8.8.8) so container resolves
  mail.monaco-opc.com to public IP instead of host loopback
- Add invite token auth: single-click accept-invite flow replacing broken
  two-email invitation process
- Auto-send invitation emails on bulk user creation
- Update email template expiry text from 24 hours to 7 days

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

docker/docker-compose.yml

@@ -13,8 +13,9 @@ services:
     image: ${REGISTRY_URL}/mopc-app:latest
     container_name: mopc-app
     restart: unless-stopped
-    extra_hosts:
-      - "host.docker.internal:host-gateway"
+    dns:
+      - 8.8.8.8
+      - 8.8.4.4
     ports:
       - "127.0.0.1:7600:7600"
     env_file: