feat(escrow_contract): implement admin dispute resolution and escrow

[DTriple-p]

Closes: #11

Description

This PR implements the admin-only dispute resolution logic for the escrow_contract to provide a trustless arbitration layer for the SwiftChain protocol. It allows the platform admin to settle paused escrows by either refunding the sender or releasing funds (minus platform fees) to the driver.

Changes

• New Feature: Added resolve_dispute function with DisputeFavour enum (Sender or Driver).
• State Transition: Implemented EscrowState::Paused (renamed from Disputed) as the required state for resolution.
• Fee Logic: Integrated platform fee deduction during driver-favor settlement.
• Code Refactoring:
  • Renamed EscrowStatus to EscrowState for better semantic clarity.
  • Added missing definitions for EscrowRecord, load_escrow, save_escrow, and require_admin.
  • Fixed broken test logic and added missing test helpers in test.rs.
• Security: Enforced admin.require_auth() and validated caller against stored admin address.
• Events: Updated event emission to include the resolution outcome.

Verification

• Both resolution paths (Sender-favour and Driver-favour) implemented and integrated into the test suite.
• Correct fund routing and state transitions verified.
• All core contract logic verified through compilation for the wasm32-unknown-unknown target.

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[Tybravo]

@Agbasimere, please resolve the conflict

[DTriple-p]

@Tybravo Resolved

[Tybravo]

@Agbasimere
The Check formatting is still making CI/CD checks to fail.

Please go to this area
Rust CI / Build and Test Contracts (pull_request)Failing after 18s

and navigate to More action to see the errors and fix it