[CONTRACTS] Add structured log for Soroban escrow creation with contract ID and seller address

[chizzy192]

Metadata

Field	Value
Domain	Contracts
Difficulty	Easy (1–2 Days)
Effort Estimate	effort: 2h
Priority	P2-Medium
Labels	good first issue, easy, Stellar Wave
Target Branch	dev
Depends On	#132

🎯 Context & Goal

When an escrow is successfully initialized on-chain, a structured log entry must be recorded containing invoiceId, sorobanContractId, sellerAddress, and amountStroops.

This issue adds structured logging inside InvoiceEscrowContractService.createEscrowOnChain().

📂 Target Files

• src/services/stellar/invoice-escrow-contract.service.ts -> Escrow creation logger

📋 Implementation Tasks

• Add logger.info() on escrow creation success
• Include invoiceId, sorobanContractId, sellerAddress, amountStroops
• Verify secret keys or tokens are not leaked in log metadata

🛠️ Technical Guidance

Use logger.info() with sanitized metadata.

🔗 References & Related

• StellarSettle Observability Standards

⏳ Delivery Window

This issue should be completed within 1 day(s) of assignment.

Contribution Workflow

1. Branch off dev: git checkout -b feature/descriptive-name dev
2. Implement all tasks in the checklist above.
3. Run all CI checks locally (see DEVELOPMENT.md).
4. Open a Pull Request targeting dev.
5. Link this issue in your PR description: Closes #XX.

✅ Acceptance Criteria

• All implementation tasks above are completed.
• Code compiles/builds without errors.
• All existing tests continue to pass.
• New tests are added with >80% coverage of new code.
• Code follows project style guidelines (formatting, linting).
• PR targets dev branch (NOT main).
• PR description references this issue.
• Documentation is updated if public API changed.

[emickwrld]

@emickwrld has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I’m a smart contract and a full-stack web developer, I have read through the issue and it’s something I’m capable of doing. Please assign me this work.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @emickwrld to this issue.