Soroban RPC Contract Calls (Backend)

[soomtochukwu]

Description
backend/src/services/stellar.rs stubs out all contract invocations. These must be wired to the live Soroban contracts so the backend can trigger on-chain state changes (milestone releases, dispute resolution).

Requirements

• Load judge authority keypair from JUDGE_AUTHORITY_SECRET
• For each method, build a Soroban InvokeHostFunctionOp XDR transaction using the stellar-xdr crate
• Fetch current sequence number from Horizon before signing each transaction
• Submit via Soroban RPC sendTransaction; poll getTransaction until confirmed or failed
• Implement release_milestone, open_dispute, and resolve_dispute

Acceptance Criteria

• Testnet integration test: release_milestone submits a real transaction and returns a valid tx hash
• A failed submission (e.g. wrong contract ID) returns Err(...) with a descriptive message
• Sequence number collision errors are retried once with a refreshed sequence number

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[ACodehunter]

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[ogazboiz]

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