- add rpc node purpose support for general/manual_verify/both
- keep scan, WSS and health checks away from manual_verify nodes
- fallback manual hash verification from general RPC to manual_verify RPC
- add public cashier hash submission path and errno responses
- update tests for RPC selection, failover and manual payment flows
Avoid marking a Solana signature as processed when order matching or
OrderProcessing fails with a retryable error. Keep terminal outcomes
idempotent while allowing later scans to retry transient failures.
- Rewrite Solana scanner: stateless scan with processed-signature cache, query wallet + USDT ATA + USDC ATA addresses to cover all SPL transfers
- Add network field to transaction_lock (4-tuple unique index) and order flow
- Add wallet management endpoints (add/list/get/status/delete) with token auth
- Add network info to Telegram payment notification
- Add USDC hint to test script GMPay prompt
- Add API docs and Solana scanning docs
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