feat: 赎回批量执行与仓位页体验优化

- 赎回：同一账户多市场合并为一笔交易，减少 Relayer 调用次数
- 仓位页：可赎回统计静默刷新，赎回按钮不再常驻 loading
- 账户导入表单、API、多语言等相关改动

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

frontend/src/locales/en/common.json

@@ -215,7 +215,29 @@
     "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": ""
+    "magicNotSupported": "",
+    "loadingProxyOptions": "Loading proxy addresses and asset information...",
+    "selectProxyOption": "Please select a proxy address",
+    "proxyOptionRequired": "Please select a proxy address",
+    "proxyOption": {
+      "magic": {
+        "description": "Email/Social Login Account (Magic)",
+        "title": "Magic Proxy Address"
+      },
+      "safe": {
+        "description": "MetaMask Browser Wallet Account (Safe)",
+        "title": "Safe Proxy Address"
+      },
+      "proxyAddress": "Proxy Address",
+      "availableBalance": "Available Balance",
+      "positionBalance": "Position Balance",
+      "totalBalance": "Total Balance",
+      "positionCount": "Position Count",
+      "noAssets": "No Assets",
+      "hasAssets": "Has Assets",
+      "error": "Failed to fetch",
+      "select": "Select this proxy address"
+    }
   },
   "leader": {
     "title": "Leader Management",

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

@@ -215,7 +215,29 @@
     "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": ""
+    "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",
+    "proxyOption": {
+      "magic": {
+        "description": "邮箱/社交账号登录账户（Magic）",
+        "title": "Magic 代理地址"
+      },
+      "safe": {
+        "description": "MetaMask 等浏览器钱包账户（Safe）",
+        "title": "Safe 代理地址"
+      },
+      "proxyAddress": "代理地址",
+      "availableBalance": "可用余额",
+      "positionBalance": "仓位余额",
+      "totalBalance": "总余额",
+      "positionCount": "持仓数量",
+      "noAssets": "无资产",
+      "hasAssets": "有资产",
+      "error": "获取失败",
+      "select": "选择此代理地址"
+    }
   },
   "leader": {
     "title": "Leader 管理",

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

@@ -215,7 +215,29 @@
     "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": ""
+    "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",
+    "proxyOption": {
+      "magic": {
+        "description": "郵箱/社群帳號登入帳戶（Magic）",
+        "title": "Magic 代理地址"
+      },
+      "safe": {
+        "description": "MetaMask 等瀏覽器錢包帳戶（Safe）",
+        "title": "Safe 代理地址"
+      },
+      "proxyAddress": "代理地址",
+      "availableBalance": "可用餘額",
+      "positionBalance": "倉位餘額",
+      "totalBalance": "總餘額",
+      "positionCount": "持倉數量",
+      "noAssets": "無資產",
+      "hasAssets": "有資產",
+      "error": "獲取失敗",
+      "select": "選擇此代理地址"
+    }
   },
   "leader": {
     "title": "Leader 管理",