Restore Kubernetes deployment support

[phinaldoo]

Ported from phinaldoo/chatui#957 and adapted to Omlorix's current repository layout and branding.

What this preserves

• restores the complete in-repository Helm chart and Kubernetes deployment assets removed from the source repository
• restores Helm validation in CI and the release preflight workflow
• restores Helm chart version synchronization in the release version tooling and tests
• restores Kubernetes-related application documentation, setup guidance, feature descriptions, and roadmap references
• restores the Kubernetes-specific health-probe wording and MIME allowance

Why this PR exists

Kubernetes support is not part of the current release. This draft preserves the complete implementation as an optional future reintroduction point instead of leaving it only in repository history.

Do not merge this PR for the current release. If Kubernetes support is reconsidered later, this branch provides a reviewable starting point that can be rebased, updated, and validated against the then-current architecture.

Impact if merged later

Merging would reintroduce the Helm/Kubernetes maintenance surface, including chart releases, CI/release validation, ingress, persistence, migrations, autoscaling, secrets, and operational documentation. Launcher, Server CLI, and Docker Compose remain the currently supported deployment paths while this PR stays unmerged.

Port validation

• Parsed the restored workflow and chart YAML successfully.
• git diff --check passed.
• Helm was not installed locally, so helm lint was not run.

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