feat: 钱包类型枚举与前端账号类型展示

后端：
- 新增 WalletType 枚举（MAGIC/SAFE），移除 safe/magic 字符串硬编码
- RelayClientService/BlockchainService/AccountService/OrderSigningService 使用枚举
- Builder Relayer API 类型使用常量 RELAYER_TYPE_PROXY/SAFE

前端：
- 账户列表、详情、导入 Modal 显示账号类型（Magic/Safe Tag）
- 导入账户 Modal 移除安全提示 Alert，移除 showAlert 与相关 i18n
- 移除无用 i18n key：securityTip、securityTipDesc、walletTypeMagic、walletTypeSafe、magicNotSupported
- 钱包类型 Tag 简化为仅显示 Magic 或 Safe

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/locales/en/common.json

@@ -53,6 +53,7 @@
     "accountId": "Account ID",
     "accountName": "Account Name",
     "walletAddress": "Wallet Address",
+    "walletType": "Wallet Type",
     "balance": "Account Balance",
     "refreshBalance": "Refresh Balance",
     "apiCredentials": "API Credentials Configuration",
@@ -122,6 +123,7 @@
     "importAccount": "Import Account",
     "accountName": "Account Name",
     "walletAddress": "Wallet Address",
+    "walletType": "Wallet Type",
     "proxyAddress": "Proxy Wallet Address",
     "apiCredentials": "API Credentials",
     "balance": "Balance",
@@ -178,8 +180,6 @@
   "accountImport": {
     "title": "Import Account",
     "back": "Back",
-    "securityTip": "Security Tip",
-    "securityTipDesc": "Private keys will be stored in the backend database. Please ensure database access is secure. HTTPS is recommended.",
     "importMethod": "Import Method",
     "privateKey": "Private Key",
     "mnemonic": "Mnemonic",
@@ -213,9 +213,6 @@
     "addressErrorMnemonic": "Cannot derive address from mnemonic",
     "walletType": "Wallet Type",
     "walletTypeHelp": "Web3 Wallet: Polymarket accounts connected via browser wallets like MetaMask\nMagic: Polymarket accounts logged in via email or social accounts (Google, Twitter, etc.)",
-    "walletTypeMagic": "Magic (Email/Social Login)",
-    "walletTypeSafe": "Web3 Wallet",
-    "magicNotSupported": "",
     "loadingProxyOptions": "Loading proxy addresses and asset information...",
     "selectProxyOption": "Please select a proxy address",
     "proxyOptionRequired": "Please select a proxy address",

frontend/src/locales/zh-CN/common.json

@@ -121,6 +121,7 @@
     "importAccount": "导入账户",
     "accountName": "账户名称",
     "walletAddress": "钱包地址",
+    "walletType": "钱包类型",
     "proxyAddress": "代理钱包地址",
     "apiCredentials": "API 凭证",
     "balance": "余额",
@@ -178,8 +179,6 @@
   "accountImport": {
     "title": "导入账户",
     "back": "返回",
-    "securityTip": "安全提示",
-    "securityTipDesc": "私钥将存储在后端数据库中，请确保数据库访问安全。建议使用 HTTPS 连接。",
     "importMethod": "导入方式",
     "privateKey": "私钥",
     "mnemonic": "助记词",
@@ -213,9 +212,6 @@
     "addressErrorMnemonic": "无法从助记词推导地址",
     "walletType": "钱包类型",
     "walletTypeHelp": "Web3钱包：使用 MetaMask 等浏览器钱包连接的 Polymarket 账户\nMagic：通过邮箱或社交账号（如 Google、Twitter）登录的 Polymarket 账户",
-    "walletTypeMagic": "Magic（邮箱/社交账号登录）",
-    "walletTypeSafe": "Web3钱包",
-    "magicNotSupported": "",
     "loadingProxyOptions": "正在获取代理地址和资产信息...",
     "selectProxyOption": "请选择代理地址",
     "proxyOptionRequired": "请选择一个代理地址",

frontend/src/locales/zh-TW/common.json

@@ -53,6 +53,7 @@
     "accountId": "賬戶ID",
     "accountName": "賬戶名稱",
     "walletAddress": "錢包地址",
+    "walletType": "錢包類型",
     "balance": "賬戶餘額",
     "refreshBalance": "刷新餘額",
     "apiCredentials": "API 憑證配置",
@@ -122,6 +123,7 @@
     "importAccount": "導入賬戶",
     "accountName": "賬戶名稱",
     "walletAddress": "錢包地址",
+    "walletType": "錢包類型",
     "proxyAddress": "代理錢包地址",
     "apiCredentials": "API 憑證",
     "balance": "餘額",
@@ -178,8 +180,6 @@
   "accountImport": {
     "title": "導入賬戶",
     "back": "返回",
-    "securityTip": "安全提示",
-    "securityTipDesc": "私鑰將存儲在後端數據庫中，請確保數據庫訪問安全。建議使用 HTTPS 連接。",
     "importMethod": "導入方式",
     "privateKey": "私鑰",
     "mnemonic": "助記詞",
@@ -213,9 +213,6 @@
     "addressErrorMnemonic": "無法從助記詞推導地址",
     "walletType": "錢包類型",
     "walletTypeHelp": "Web3錢包：使用 MetaMask 等瀏覽器錢包連接的 Polymarket 帳戶\nMagic：透過郵箱或社群帳號（如 Google、Twitter）登入的 Polymarket 帳戶",
-    "walletTypeMagic": "Magic（郵箱/社群帳號登入）",
-    "walletTypeSafe": "Web3錢包",
-    "magicNotSupported": "",
     "loadingProxyOptions": "正在獲取代理地址和資產信息...",
     "selectProxyOption": "請選擇代理地址",
     "proxyOptionRequired": "請選擇一個代理地址",