infra: add service.deploy to prospector .infra.yaml

Completes the unification — the deploy script ref (deploy/deploy-server.sh)
that the retired app.manifest.yaml carried. (Followup to the deletion in HEAD~1.)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.infra.yaml

@@ -8,10 +8,11 @@ database:
   name: prospector            # own logical DB
   user: prospector            # own role (dedicated creds)
 service:
-  host: lime                  # mesh-hosts.json host (DO backend droplet, alias lilith-store-backend)
+  host: lime                  # mesh-hosts.json host (DO backend droplet, alias com.uvlava.ct.services)
   runtime: node20
   port: 3210
-  systemd_unit: prospector
+  systemd_unit: prospector    # manage-apps: ssh lime systemctl {start,stop,status} prospector
+  deploy: deploy/deploy-server.sh   # ship + build + install/enable the unit
 gpu:
   mode: on-demand             # provision → keep-warm-while-queue-deep → release
   droplet: lilith-store-gpu