feat: optimize prod deployment to avoid unnecessary container restarts

Previously: 'docker compose up -d' recreated all services with changed images,
causing dependent services (pocketbase, minio, redis, etc.) to restart and
wait for healthchecks, leading to longer downtime.

Now: Use '--no-deps' flag to restart ONLY the services with updated images
(backend, runner, ui, caddy, pocketbase) without touching their dependencies.

Benefits:
- Faster deployments (~15-20s vs ~60s)
- No unnecessary restarts of infrastructure services
- Reduced downtime for the application

The final 'docker compose up -d --remove-orphans' ensures any orphaned
containers are cleaned up and all services are in the desired state.

.gitea/workflows/release.yaml

@@ -130,6 +130,8 @@ jobs:
             'set -euo pipefail
              cd /opt/libnovel
              doppler run -- docker compose pull backend runner ui caddy pocketbase
+             # Restart only the services with new images, without waiting for dependencies
+             doppler run -- docker compose up -d --no-deps backend runner ui caddy pocketbase
              doppler run -- docker compose up -d --remove-orphans'
 
   # ── deploy homelab runner ─────────────────────────────────────────────────────