docs: add portable from-zero deploy runbook and GitOps templates

Document server-side rollout (values, Sealed Secrets, logging, greenfield
reset) with environment variables so any cluster can follow the same steps.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/gitops-deploy.sh

@@ -6,13 +6,18 @@ ROOT="$(cd "$(dirname "$0")/.." && pwd)"
 NAMESPACE="${NAMESPACE:-cloudhost}"
 RELEASE="${RELEASE:-cloudhost}"
 # Production values now live in the cloud-host-gitops repo (platform/values-abrban.yaml).
+# Fallback: example template in this repo for bootstrap / local helm.
 VALUES="${VALUES:-${ROOT}/../cloud-host-gitops/platform/values-abrban.yaml}"
+if [[ ! -f "${VALUES}" ]]; then
+  VALUES="${ROOT}/gitops/platform/values-abrban.example.yaml"
+fi
 TAG="${TAG:-}"
 
 if [[ ! -f "${VALUES}" ]]; then
-  echo "ERROR: values file not found: ${VALUES}" >&2
+  echo "ERROR: values file not found." >&2
   echo "Clone the GitOps repo next to this one, or pass VALUES=/path/to/values-abrban.yaml:" >&2
   echo "  git clone https://git.abrban.com/abrban/cloud-host-gitops.git" >&2
+  echo "Or copy gitops/platform/values-abrban.example.yaml to your gitops repo." >&2
   exit 1
 fi