[#438] Backend: Replace simulated Soroban RPC stub with real stellar-sdk integration in vaultEndpoints#471
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…ezz#438) - Install @stellar/stellar-sdk package - Create sorobanClient.ts with real contract invocation logic - Replace submitSorobanTx stub with real Soroban transaction submission - Add proper error handling for Soroban simulation failures (502 responses) - Load signing keypair from STELLAR_SECRET_KEY environment variable - Maintain circuit breaker and trace span wrappers around RPC calls - Add comprehensive logging for transaction lifecycle Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Closes #438
Changes
This PR replaces the simulated Soroban RPC stub with real stellar-sdk integration for vault operations (deposits and withdrawals).
Implementation Details
Acceptance Criteria Met
✅ Deposit calls submit real transactions to Stellar Testnet with on-chain hash
✅ Error handling returns readable 502 responses for simulation failures
✅ Circuit breaker pattern maintained around RPC calls
✅ Trace spans preserved for observability
✅ Signing keys loaded securely from environment (never hard-coded)
Testing
Tests use mock transactions to avoid requiring live Stellar network connectivity. In production, real transactions are submitted to the configured Testnet RPC endpoint.