feat: add multi-network payment support

- Redesign payment UI with a two-step flow (select coin/network → pay)
  - Add wallet address validation in Telegram bot
  - Rename NetworkEthereum constant from "eth" to "ethereum"

src/telegram/handle.go

@@ -14,7 +14,7 @@ import (
 )
 
 const (
-	ReplayAddWallet         = "请发给我 TRON（T 开头）或以太坊主网（0x 开头）收款地址"
+	ReplayAddWallet         = "请发给我 TRON（T 开头）、以太坊主网（0x 开头）或 Solana 收款地址"
 	pendingWalletAddressTTL = 5 * time.Minute
 )
 
@@ -53,8 +53,10 @@ func OnTextMessageHandle(c tb.Context) error {
 		_, err = data.AddWalletAddress(msgText)
 	case isValidEthereumAddress(msgText):
 		_, err = data.AddWalletAddressWithNetwork(mdb.NetworkEthereum, strings.ToLower(msgText))
+	case isValidSolanaAddress(msgText):
+		_, err = data.AddWalletAddressWithNetwork(mdb.NetworkSolana, msgText)
 	default:
-		_ = c.Send(fmt.Sprintf("钱包 [%s] 添加失败：不是合法的 TRON 或以太坊地址", msgText))
+		_ = c.Send(fmt.Sprintf("钱包 [%s] 添加失败：不是合法的 TRON、以太坊或 Solana 地址", msgText))
 		return nil
 	}
 	if err != nil {

src/telegram/utils.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/btcsuite/btcutil/base58"
+	"github.com/gagliardetto/solana-go"
 )
 
 // isValidEthereumAddress 校验 0x + 20 字节十六进制（主网收款）。
@@ -44,3 +45,13 @@ func isValidTronAddress(addr string) bool {
 
 	return string(checksum) == string(hash2[:4])
 }
+
+// isValidSolanaAddress 校验 Solana Base58 地址是否合法（32 字节公钥）。
+func isValidSolanaAddress(addr string) bool {
+	addr = strings.TrimSpace(addr)
+	if len(addr) < 32 || len(addr) > 44 {
+		return false
+	}
+	_, err := solana.PublicKeyFromBase58(addr)
+	return err == nil
+}