feat: support TON and USDT Jetton payments

- add TON chain, token, RPC, address normalization, and order matching support
- add liteclient scanner with masterchain/shard catch-up and Jetton validation
- add TON manual payment verification and focused tests

src/internal/testutil/testdb.go

@@ -12,6 +12,7 @@ import (
 	"github.com/spf13/viper"
 	"go.uber.org/zap"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 	"gorm.io/gorm/logger"
 	"gorm.io/gorm/schema"
 )
@@ -65,11 +66,19 @@ func SetupTestDatabases(t testing.TB) func() {
 	// Seed all standard chains as enabled so IsChainEnabled checks pass.
 	for _, network := range []string{
 		mdb.NetworkTron, mdb.NetworkSolana, mdb.NetworkEthereum,
-		mdb.NetworkBsc, mdb.NetworkPolygon, mdb.NetworkPlasma,
+		mdb.NetworkBsc, mdb.NetworkPolygon, mdb.NetworkPlasma, mdb.NetworkTon,
 	} {
 		mainDB.Create(&mdb.Chain{Network: network, Enabled: true})
 	}
 
+	mainDB.Clauses(clause.OnConflict{DoNothing: true}).Create(&[]mdb.ChainToken{
+		{Network: mdb.NetworkTron, Symbol: "USDT", ContractAddress: "TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t", Decimals: 6, Enabled: true},
+		{Network: mdb.NetworkEthereum, Symbol: "USDT", ContractAddress: "0xdAC17F958D2ee523a2206206994597C13D831ec7", Decimals: 6, Enabled: true},
+		{Network: mdb.NetworkBsc, Symbol: "USDT", ContractAddress: "0x55d398326f99059fF775485246999027B3197955", Decimals: 18, Enabled: true},
+		{Network: mdb.NetworkTon, Symbol: "TON", ContractAddress: "", Decimals: 9, Enabled: true},
+		{Network: mdb.NetworkTon, Symbol: "USDT", ContractAddress: "0:b113a994b5024a16719f69139328eb759596c38a25f59028b146fecdc3621dfe", Decimals: 6, Enabled: true},
+	})
+
 	// Seed two universal api_keys rows. Both usable for EPAY/GMPAY
 	// flows; the numeric PID 1001 row lets legacy tests that submit
 	// `pid=1001` still match.