feat(monitoring): add operator metrics and tenant health polling

[GatewayJ]

Type of Change

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

Related Issues

N/A

Summary of Changes

Adds production-oriented monitoring for RustFS Operator and Console, aligned with MinIO Operator-style storage health visibility.

• Adds Prometheus text exposition for reconcile count, duration, errors, requeues, in-flight work, leader state, STS requests, HTTP requests, and tenant storage health.
• Adds an operator observability server with /metrics, /healthz, and a real Kubernetes control-plane /readyz check.
• Adds tenant storage health polling through RustFS admin /rustfs/admin/v3/info, including online/offline/healing drives, raw capacity/usage, object usage, write quorum, and health gauges.
• Adds Console /metrics and initializes tracing for the Console server path.
• Adds Helm values, metrics Service, optional ServiceMonitor resources, optional PrometheusRule alerts, and dev metrics Service manifests.

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] (N/A: this repository does not currently include CHANGELOG.md)
• CI/CD passed (if applicable)

Impact

• Breaking change (CRD/API compatibility)
• Requires doc/config/deployment update
• Other impact: exposes new operator metrics port 8080 by default and optional Prometheus Operator resources.

Verification

cargo check
cargo test
make pre-commit

Additional Notes

• The controller queue metric is represented by rustfs_operator_reconcile_inflight and rustfs_operator_reconcile_requeues_total; kube-runtime does not expose internal queue depth through a stable public API.
• helm template was not run locally because helm is not installed in this environment.

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