refactor(iac): cluster split — 1 cluster per plane, breakpilot-* naming (#6)

3 Orca clusters (breakpilot-edge / breakpilot-control / breakpilot-app), 1 plane each. Single-VM core with Keycloak co-tenant on vm-edge. App cluster gets prod + stage VMs. Manifests reorganized into clusters/<name>/services/; validator now enforces per-cluster node whitelist. Multi-VM rollout gated on legal entity.

clusters/breakpilot-edge/services/pg-keycloak.toml

@@ -0,0 +1,22 @@
+# pg-keycloak stub — full config lands in M2.1.
+# Host: vm-edge. Resource budget per INFRASTRUCTURE.md §6 co-tenant notes.
+
+[[service]]
+name = "pg-keycloak"
+image = "postgres:16-alpine"
+port = 5432
+
+[service.placement]
+node = "vm-edge"
+
+[service.resources]
+memory = "512Mi"
+cpu = 0.5
+
+[service.volume]
+path = "/var/lib/postgresql/data"
+
+[service.env]
+POSTGRES_DB = "keycloak"
+POSTGRES_USER = "keycloak"
+POSTGRES_PASSWORD = "${secrets.PG_KEYCLOAK_PASSWORD}"