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* Include k8s deployment instructions * Use helm for deployment * docs(self-host): add Helm / Kubernetes deployment to quickstart (en + zh) * fix(helm): gate backend ExternalName alias behind a value The unprefixed Service/backend in the chart is load-bearing, but as written it limits the chart to one release per namespace and fails helm install whenever a Service/backend already exists in the namespace (without --take-ownership). Gate the alias behind frontend.compatibility.backendAlias (default true, so existing installs are unchanged). Operators running a web image with a patched REMOTE_API_URL can set it to false to drop the Service entirely. Document the one-release-per-namespace constraint and the opt-out in values.yaml and the SELF_HOSTING.md Kubernetes section. Addresses review item #1 on PR #2377. * fix(helm): add backend startupProbe so cold installs survive migrations The entrypoint runs `./migrate up` before serving traffic. On a cold cluster (Postgres still coming up) this can take minutes, during which the livenessProbe (initialDelaySeconds 30 / periodSeconds 30) trips and restarts the pod 1-2 times. Add a startupProbe on /healthz (failureThreshold 30, periodSeconds 10, ~5 min budget). Kubernetes disables liveness/readiness until it passes, so migrations finish without the pod being killed, and the aggressive livenessProbe is untouched for steady-state. Update the SELF_HOSTING.md install step, which no longer expects 1-2 restarts. Addresses review item #2 on PR #2377. * fix(helm): roll backend pods on config/secret change via checksum annotations envFrom does not watch the referenced ConfigMap/Secret, and helm upgrade alone does not change the pod template hash, so editing values.yaml + `helm upgrade` left the old backend pods running stale config. Add checksum/config (hash of the rendered configmap.yaml) and checksum/secret (hash of the live existingSecret via lookup, since it is created out-of-band and has no chart template) to the backend pod template. Config edits now actually re-roll the backend on upgrade, and Secret rotations do too. lookup is empty under `helm template`/`--dry-run`; that placeholder is harmless and documented inline. Addresses review item #3 on PR #2377. * docs(self-host): sync quickstart with new startupProbe behavior SELF_HOSTING.md was updated to reflect that the backend now stays Running but not Ready while Postgres comes up (startupProbe absorbs it, so no restart), but the EN/ZH quickstart docs still described the pre-startupProbe behavior of "may restart 1-2 times". Bring them in line. Co-authored-by: multica-agent <github@multica.ai> --------- Co-authored-by: Bohan Jiang <52446949+Bohan-J@users.noreply.github.com> Co-authored-by: multica-agent <github@multica.ai>