refactor(backend): 统一账户平台标识字段

WHAT: 统一 Claude 账户的平台标识，从 claude-oauth 改为 claude
WHY: 简化平台标识命名规范，提高前后端数据一致性，为多平台支持奠定基础
HOW: 在账户创建和查询接口中添加 platform 字段支持；更新 claudeAccountService 默认平台标识；保持向后兼容性，旧数据自动使用默认值

src/routes/admin.js

@@ -1242,6 +1242,7 @@ router.post('/claude-accounts', authenticateAdmin, async (req, res) => {
       claudeAiOauth,
       proxy,
       accountType,
+      platform = 'claude',
       priority,
       groupId
     } = req.body
@@ -1279,6 +1280,7 @@ router.post('/claude-accounts', authenticateAdmin, async (req, res) => {
       claudeAiOauth,
       proxy,
       accountType: accountType || 'shared', // 默认为共享类型
+      platform,
       priority: priority || 50 // 默认优先级为50
     })
 

src/services/claudeAccountService.js

@@ -55,6 +55,7 @@ class ClaudeAccountService {
       proxy = null, // { type: 'socks5', host: 'localhost', port: 1080, username: '', password: '' }
       isActive = true,
       accountType = 'shared', // 'dedicated' or 'shared'
+      platform = 'claude',
       priority = 50, // 调度优先级 (1-100，数字越小优先级越高)
       schedulable = true, // 是否可被调度
       subscriptionInfo = null // 手动设置的订阅信息
@@ -79,7 +80,8 @@ class ClaudeAccountService {
         scopes: claudeAiOauth.scopes.join(' '),
         proxy: proxy ? JSON.stringify(proxy) : '',
         isActive: isActive.toString(),
-        accountType, // 账号类型：'dedicated' 或 'shared'
+        accountType, // 账号类型：'dedicated' 或 'shared' 或 'group'
+        platform,
         priority: priority.toString(), // 调度优先级
         createdAt: new Date().toISOString(),
         lastUsedAt: '',
@@ -108,7 +110,8 @@ class ClaudeAccountService {
         scopes: '',
         proxy: proxy ? JSON.stringify(proxy) : '',
         isActive: isActive.toString(),
-        accountType, // 账号类型：'dedicated' 或 'shared'
+        accountType, // 账号类型：'dedicated' 或 'shared' 或 'group'
+        platform,
         priority: priority.toString(), // 调度优先级
         createdAt: new Date().toISOString(),
         lastUsedAt: '',
@@ -151,6 +154,7 @@ class ClaudeAccountService {
       isActive,
       proxy,
       accountType,
+      platform,
       priority,
       status: accountData.status,
       createdAt: accountData.createdAt,
@@ -444,7 +448,7 @@ class ClaudeAccountService {
             errorMessage: account.errorMessage,
             accountType: account.accountType || 'shared', // 兼容旧数据，默认为共享
             priority: parseInt(account.priority) || 50, // 兼容旧数据，默认优先级50
-            platform: 'claude-oauth', // 添加平台标识，用于前端区分
+            platform: account.platform || 'claude', // 添加平台标识，用于前端区分
             createdAt: account.createdAt,
             lastUsedAt: account.lastUsedAt,
             lastRefreshAt: account.lastRefreshAt,