fix(setup): GKE tweaks, gateway-hostname capture, stable-version filter

[rashadism]

From a multi-cluster GKE install run.

• on-your-environment.md — GKE platform tweaks: L4 LB provisioning is async (a pending external IP isn't a failure), and the managed fluentbit-gke DaemonSet owns host port 2020 (install the logs module's fluent-bit with hostNetwork:false + Use_Kubelet Off, else records ship without kubernetes.* fields and the logs adapter rejects them).
• multi-cluster.md — capture each externally-reached gateway hostname up front; settle the apps domain before deploying apps, since it's baked into rendered routes (changing it later means re-rendering).
• fetch-page.sh / list-versions.sh — resolve latest-stable by matching a plain vX.Y.x/vX.Y.Z positively instead of denylisting known pre-release suffixes, so milestone tags (e.g. v1.2.0-m.1, currently the top entry in versions.json) aren't served as "latest stable".

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