fix(console): use console service account in login hint

[GatewayJ]

Type of Change

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

Related Issues

Fixes #160

Summary of Changes

• Update the Console login help command to create a token for the chart-managed Console ServiceAccount instead of the operator controller ServiceAccount.
• Add Helm install notes that print the exact token command using the release namespace and consoleServiceAccountName helper.
• Clarify the chart README and operator user guides to follow Helm install notes when namespace or Console ServiceAccount names are customized.

Root cause: the Console login form documented rustfs-operator, but Console login expects a Kubernetes bearer token with the Console RBAC permissions granted to rustfs-operator-console by default.

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 (if needed)
• CHANGELOG.md updated under [Unreleased] (if user-visible change)
• CI/CD passed (if applicable)

Impact

• Breaking change (CRD/API compatibility)
• Requires doc/config/deployment update
• Other impact:

Verification

make pre-commit

Additional Notes

No runtime RBAC or authentication behavior changes are included; this only aligns user-facing token guidance with the existing Console ServiceAccount boundary.

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