Implement End-to-End Tests on Testnet with Real Wallets

[famvilianity-eng]

Implement End-to-End Tests on Testnet with Real Wallets

Priority: High
Estimated Time: 3 hours

Description

All tests use mock Soroban environment. Real testnet deployment could reveal issues with wallet integration, network conditions, or fee calculation.

Tasks

• Create e2e_tests.rs that uses real testnet RPC endpoints
• Test full flow: create match, both players deposit, submit result, verify payout
• Use funded testnet wallets (generated in CI)
• Verify payout transactions on testnet ledger
• Add e2e test guide to docs/e2e-testing.md

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