Migrated forgejo service and configuration to trantor. Added nginx reverse
proxy support on trantor with ACME configuration for SSL certificates.
Fixed vaultwarden domain in shared services from vault.baduhai.dev to
pass.baduhai.dev to match actual nginx configuration.
Created centralized service definitions in shared/services.nix to store
service metadata (domains, IPs, ports) that need to be accessible across
multiple hosts. This replaces the per-service split DNS module approach
with a single source of truth.
Services are now exported through utils.nix for easy access in host configs.
