feat: add Solana payment scanning with USDT/USDC support and wallet management API

- 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

src/mq/worker.go

@@ -23,6 +23,7 @@ const sqliteBusyRetryAttempts = 3
 type expirableOrder struct {
 	ID             uint64  `gorm:"column:id"`
 	TradeId        string  `gorm:"column:trade_id"`
+	Network        string  `gorm:"column:network"`
 	ReceiveAddress string  `gorm:"column:receive_address"`
 	Token          string  `gorm:"column:token"`
 	ActualAmount   float64 `gorm:"column:actual_amount"`
@@ -65,7 +66,7 @@ func processExpiredOrders() {
 		var orders []expirableOrder
 		err := withSQLiteBusyRetry(func() error {
 			return dao.Mdb.Model(&mdb.Orders{}).
-				Select("id", "trade_id", "receive_address", "token", "actual_amount").
+				Select("id", "trade_id", "network", "receive_address", "token", "actual_amount").
 				Where("status = ?", mdb.StatusWaitPay).
 				Where("created_at <= ?", expirationCutoff).
 				Order("id asc").
@@ -89,7 +90,7 @@ func processExpiredOrders() {
 			if !expired {
 				continue
 			}
-			if err = data.UnLockTransaction(order.ReceiveAddress, order.Token, order.ActualAmount); err != nil {
+			if err = data.UnLockTransaction(order.Network, order.ReceiveAddress, order.Token, order.ActualAmount); err != nil {
 				log.Sugar.Warnf("[mq] release expired transaction lock failed, trade_id=%s, err=%v", order.TradeId, err)
 			}
 		}