chore(argocd): update api-gateway to track homelab-frontend prod branch

k8s/argocd/apps/55-api-gateway.yaml

@@ -9,8 +9,14 @@
 # `POST /v1/chat/completions` covers every model. See
 # docs/adr/ADR-0001-retire-kong-for-go-gateway.md in the frontend repo.
 #
+# UPDATED 2026-08-21: Tracks prod branch of homelab-frontend (not main).
+# Image promotion via kustomization:
+#   cd k8s && kustomize edit set image forgejo.riotpiao.com/rock/api-gateway=forgejo.riotpiao.com/rock/api-gateway:<commit-sha>
+#   git add kustomization.yaml && git commit -m "chore(deploy): promote api-gateway to <commit-sha>"
+#   git push origin prod
+#
 # Two sources:
-#   1. rock/homelab-frontend on the in-cluster Forgejo — the gateway's own
+#   1. rock/homelab-frontend on the in-cluster Forgejo (prod branch) — the gateway's own
 #      kustomization (Deployment, Service, ConfigMap, RBAC, NetworkPolicy). It
 #      sets `namespace: api` itself, so no transformer is needed here. The
 #      Forgejo host must stay listed in the `homelab` AppProject sourceRepos or
@@ -37,7 +43,7 @@ spec:
   revisionHistoryLimit: 3
   sources:
     - repoURL: https://forgejo.riotpiao.com/rock/homelab-frontend.git
-      targetRevision: main
+      targetRevision: prod
       path: k8s
     - repoURL: https://github.com/Riotpiaole/riotpiao.homelab.com.git
       targetRevision: main