fix(promoter): correct Forgejo registry service hostname

forgejo-gitea-http.cicd.svc.cluster.local (headless svc, port 3000)
not forgejo-gitea (doesn't exist). Also wire REGISTRY_BASE env var
in deployment.yaml so it can be overridden without code change.

k8s/network-policy.yaml

@@ -158,11 +158,16 @@ spec:
     ports:
     - protocol: TCP
       port: 3000
-  # Allow to kubernetes API server (ArgoCD Application patching via in-cluster SA)
+  # Allow to kubernetes API server (ArgoCD Application patching via in-cluster SA).
+  # kube-apiserver runs on host network (192.168.1.162/166:6443) — must use ipBlock.
+  # ClusterIP 10.96.0.1:443 also routes there, covered by the 10.96.0.0/12 CIDR.
   - to:
-    - namespaceSelector:
-        matchLabels:
-          kubernetes.io/metadata.name: default
+    - ipBlock:
+        cidr: 10.96.0.0/12
+    - ipBlock:
+        cidr: 192.168.1.0/24
     ports:
     - protocol: TCP
       port: 443
+    - protocol: TCP
+      port: 6443