feat(billing): rate archived usage periods (Phase 2 Rating)

[law-chain-hot]

Summary

• add versioned pricing plans with effective time ranges
• convert archived Box usage periods into immutable rated periods
• preserve pricing snapshots so historical charges remain explainable

Stack

• Depends on feat(usage): add box usage metering ledger (Phase 1 Usage) #969
• Next layer: Wallet and settlement

Validation

• Rating focused tests: 15/15 passed

Review

Review only the diff against codex/billing-v3-pr1-usage.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/billing-v3-pr2-rating

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