Backup & Domain Stability Fixes

Fixed

• Fixed server backup failing to restart apps after backup completes — stopped containers now restart reliably using the correct compose files instead of re-querying Docker mid-backup

• Fixed domain setup breaking apps that use custom Docker networks — connecting a domain no longer injects a conflicting "default" network into stacks that already define their own

• Fixed domain setup silently failing when Traefik labels aren't applied — the operation now reports a clear error instead of appearing to succeed

• Fixed domain modal hanging when Docker port discovery is slow — a 15-second timeout ensures the modal always opens, even on servers with many containers

• Fixed backup "stop containers" setting defaulting to off — consistent backups now correctly stop containers by default for volume consistency