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Users can now customize the subdomain for each app during deployment instead of using a fixed value. The deploy page shows an editable text input with the default pre-filled and the base domain as a suffix. New "subdomain" deploy field type with DNS-safe format validation, reserved name blocklist, and uniqueness check across deployed stacks. Locked after deploy — changing requires Remove + Redeploy. Backward compatible: InjectMissingFields() auto-fills SUBDOMAIN from .felhom.yml defaults for existing deployed apps on next sync/restart. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>