fix: 修复 walletType 字段问题和 WebSocket 内存泄漏，优化账户导入 UI

后端修复：
- 添加 walletType 字段到 Account 实体和数据库（V17 迁移）
- 修复 refreshProxyAddress 方法使用正确的 walletType
- 修复 WebSocketTicketService 内存泄漏（添加定时清理任务）

前端优化：
- 账户导入改为 Modal 弹窗，提升用户体验
- 默认钱包类型改为 Web3 Wallet（safe），并将其选项排在首位
- 更新多语言文本：将 MetaMask（浏览器钱包）改为 Web3钱包
- 修复 walletTypeHelp Tooltip 换行显示问题

backend/src/main/kotlin/com/wrbug/polymarketbot/dto/AccountDto.kt

@@ -73,6 +73,7 @@ data class AccountDto(
     val proxyAddress: String,  // Polymarket 代理钱包地址
     val accountName: String?,
     val isEnabled: Boolean,  // 是否启用（用于订单推送等功能的开关）
+    val walletType: String = "magic",  // 钱包类型：magic（邮箱/OAuth登录）或 safe（MetaMask浏览器钱包）
     val apiKeyConfigured: Boolean,  // API Key 是否已配置（不返回实际 Key）
     val apiSecretConfigured: Boolean,  // API Secret 是否已配置
     val apiPassphraseConfigured: Boolean,  // API Passphrase 是否已配置

backend/src/main/kotlin/com/wrbug/polymarketbot/entity/Account.kt

@@ -40,6 +40,9 @@ data class Account(
     @Column(name = "is_enabled", nullable = false)
     val isEnabled: Boolean = true,  // 是否启用（用于订单推送等功能的开关）
     
+    @Column(name = "wallet_type", nullable = false, length = 20)
+    val walletType: String = "magic",  // 钱包类型：magic（邮箱/OAuth登录）或 safe（MetaMask浏览器钱包）
+    
     @Column(name = "created_at", nullable = false)
     val createdAt: Long = System.currentTimeMillis(),
     

backend/src/main/kotlin/com/wrbug/polymarketbot/service/accounts/AccountService.kt

@@ -151,6 +151,7 @@ class AccountService(
                 accountName = accountName,
                 isDefault = false,  // 不再支持默认账户
                 isEnabled = request.isEnabled,
+                walletType = request.walletType,  // 保存钱包类型
                 createdAt = System.currentTimeMillis(),
                 updatedAt = System.currentTimeMillis()
             )
@@ -211,9 +212,9 @@ class AccountService(
             val account = accountRepository.findById(accountId)
                 .orElse(null) ?: return Result.failure(IllegalArgumentException("账户不存在"))
 
-            // 重新获取代理地址
+            // 重新获取代理地址（使用保存的钱包类型）
             val proxyAddress = runBlocking {
-                val proxyResult = blockchainService.getProxyAddress(account.walletAddress)
+                val proxyResult = blockchainService.getProxyAddress(account.walletAddress, account.walletType)
                 if (proxyResult.isSuccess) {
                     proxyResult.getOrNull()
                         ?: throw IllegalStateException("获取代理地址返回空值")
@@ -250,7 +251,7 @@ class AccountService(
             accounts.forEach { account ->
                 try {
                     val proxyAddress = runBlocking {
-                        val proxyResult = blockchainService.getProxyAddress(account.walletAddress)
+                        val proxyResult = blockchainService.getProxyAddress(account.walletAddress, account.walletType)
                         if (proxyResult.isSuccess) {
                             proxyResult.getOrNull()
                         } else {
@@ -443,6 +444,7 @@ class AccountService(
                 proxyAddress = account.proxyAddress,
                 accountName = account.accountName,
                 isEnabled = account.isEnabled,
+                walletType = account.walletType,
                 apiKeyConfigured = account.apiKey != null,
                 apiSecretConfigured = account.apiSecret != null,
                 apiPassphraseConfigured = account.apiPassphrase != null,

backend/src/main/kotlin/com/wrbug/polymarketbot/service/auth/WebSocketTicketService.kt

@@ -1,5 +1,6 @@
 package com.wrbug.polymarketbot.service.auth
 
+import org.springframework.scheduling.annotation.Scheduled
 import org.springframework.stereotype.Service
 import java.security.SecureRandom
 import java.util.concurrent.ConcurrentHashMap
@@ -80,4 +81,13 @@ class WebSocketTicketService {
         val now = System.currentTimeMillis()
         tickets.entries.removeIf { it.value.expiresAt < now }
     }
+    
+    /**
+     * 定时清理过期票据（每分钟执行一次）
+     * 防止过期票据长时间占用内存
+     */
+    @Scheduled(fixedRate = 60_000)  // 60秒 = 60000毫秒
+    fun scheduledCleanup() {
+        cleanupExpiredTickets()
+    }
 }