Feature/meta transactions and claims

[yongqjn]

Summary

This PR adds meta-transaction support and claim-based partial settlement flows for ERC-8183.

Meta-transactions

• Adds ERC8183WithAuthorization, an EIP-712 authorization wrapper around ERC-8183 lifecycle actions.
• Supports relayed execution for:
  • createJob
  • setProvider
  • setBudget
  • fund
  • submit
  • complete
  • reject
  • submitClaim
  • approveClaim
  • rejectClaim
• Uses packed authorization nonces scoped by signer: bytes20(signer) || uint72 nonce.
• Supports ERC-1271 contract-wallet signatures via OpenZeppelin SignatureChecker.
• Reserves authorization nonces before signature validation to avoid ERC-1271 reentrancy/replay edge cases.

Claims / partial settlement

• Adds claim-based incremental settlement while a job remains Funded.
• Supports two claim styles:
  • direct submitClaim, called by the client without voucher signatures
  • submitClaimWithAuthorization, relayed using the client’s EIP-712 signature
• If deliverable == bytes32(0), the claim settles immediately.
• If deliverable != bytes32(0), the claim records a pending hash and requires approval or rejection.
• Adds approveClaim / rejectClaim and authorization-backed equivalents.
• Tracks settledAmount so complete, reject, and claimRefund only operate on remaining escrow.