fix(security): warn on root tenant workloads

[GatewayJ]

Type of Change

• New Feature
• Bug Fix
• Documentation
• Performance Improvement
• Test/CI
• Refactor
• Other:

Related Issues

Closes rustfs/backlog#1093

Summary of Changes

• Preserve backward compatibility for workloads with an effective runAsUser: 0 and runAsNonRoot: false.
• Emit a structured Operator warning containing the Tenant and Pool whenever a workload resolves to UID 0, with guidance to migrate to a non-zero UID.
• Keep the existing rejection for the contradictory runAsUser: 0 and runAsNonRoot: true combination.
• Add Console compatibility coverage and document the warning and migration recommendation in the English and Chinese user guides.

The secure defaults already render non-root workloads, but explicit overrides can opt into UID 0. Hard rejection would invalidate previously accepted Tenant resources, so this revision uses the warning option described in the issue and leaves the CRD/API compatibility unchanged.

Checklist

• I have read and followed the CONTRIBUTING.md guidelines
• Passed make pre-commit (fmt-check + clippy + test + console-lint + console-fmt-check)
• Added/updated necessary tests
• Documentation updated
• CHANGELOG.md updated under [Unreleased] (N/A: no changelog file exists in the repository)
• CI/CD passed (pending upstream CI)

Impact

• Breaking change (CRD/API compatibility)
• Requires doc/config/deployment update
• Other impact: existing root workloads continue to reconcile and now produce a warning recommending migration.

Verification

make pre-commit

Additional Notes

Default-generated workloads remain non-root. The CRD continues to accept Kubernetes UID 0 for backward compatibility, and runAsGroup/fsGroup behavior is unchanged.

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[GatewayJ]

@codex

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: fac8c06e3d

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