improve health checks across all nomad job specs

- traefik: TCP → HTTP check on /ping (enable ping entrypoint)
- gitea: check path → /api/healthz
- jellyfin: TCP → HTTP check on /health
- glance: TCP → HTTP check on /
- sonarr/prowlarr: check path / → /ping (×2 checks each)
- ntfy/transfer/deluge/openreader/authelia/pgadmin: add name and port to existing checks
- postgres: remove invalid TCP check (Connect-enabled service)
- unifi: TCP → script check via curl (macvlan host isolation workaround)

2-nomad-config/1-data/postgres.nomad.hcl

@@ -7,6 +7,10 @@ job "postgres" {
       connect {
         sidecar_service {}
       }
+
+      # Note: TCP checks are not valid for Connect-enabled services (runs through
+      # Envoy sidecar). Postgres is a single-writer DB that we never canary, so
+      # observable health via Consul is lower priority than other services.
     }
 
     task "postgres" {