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.
Removed the split-dns.nix module and all service-specific splitDNS.entries
configurations. Service DNS records are now sourced from the centralized
shared/services.nix file instead of being declared individually in each
service configuration.
