Implement Soroban client service`

[Nemenwq]

Dependencies: Issue #26.

Context:
All services need a consistent way to call Soroban contracts.

Scope:

• In scope: A shared wrapper with call + simulate helpers.
• Out of scope: Full key management solution.

Implementation Notes:

• Provide a single interface used across services so it’s easy to mock in unit tests.
• Centralize:
  • network selection (testnet/mainnet)
  • contract IDs
  • fee settings / timeout defaults

Acceptance Criteria:

• callContract and simulateTransaction available.
• Signing handled internally (from env/secure config).

Files: backend/shared/soroban-client/

[2411015047-afk]

Hi! I specialize in building Soroban automation tools and shared service wrappers.

This Soroban client service is a well-defined task. I can implement:

• callContract and simulateTransaction helpers with proper error handling
• Network configuration (testnet/mainnet) centralized in one place
• Fee settings and timeout defaults following Stellar best practices
• Easy-to-mock interface for unit testing

I've built similar Soroban RPC wrappers and contract invocation tools. Fast delivery, happy to discuss scope.

Rate: $50-100 depending on final scope. DM me or comment here if interested.

[Nemenwq]

hello @2411015047-afk please go ahead