Improve benchmark lifecycle and result history

[ludfjig]

Summary

• Correct Restore, Reuse, and Renew behavior across the benchmark handlers.
• Normalize request inputs and improve peak-memory sampling.
• Version benchmark definitions and preserve selectable result histories.
• Clarify runtime lifecycle details and request-time code-selection limitations.
• Improve dashboard comparison, labeling, tables, and responsive styling.

Validation

• CARGO_NET_OFFLINE=true npm run benchmark:local -- --platform kvm --smoke (54/54 configurations passed)
• git diff --check