refactor: decouple PF harvest into strategy

[web3nerdy]

Note

Removes auto performance fee harvest from off-chain hedge reporting and makes BasisStrategy.harvestPerformanceFee operator-gated, updating tests accordingly.

• Contracts:
  • src/hedge/offchain/OffChainPositionManager.sol: Remove automatic harvestPerformanceFee call from reportState.
  • src/strategy/BasisStrategy.sol: Change harvestPerformanceFee() authorization from hedgeManager() to operator(); still forwards to vault.
• Tests:
  • test/unit/BasisStrategyOffchain.t.sol: Update to call strategy.harvestPerformanceFee() as operator and add assertions for PF distribution; minor adjustments to workflows invoking state reports.

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