feat: 实现Claude账户专属绑定功能

- 添加账户类型（dedicated/shared）支持
- API Key可绑定专属账户，优先使用绑定账户
- 未绑定的API Key继续使用共享池和粘性会话
- 修复专属账户下拉框显示问题（isActive类型不匹配）
- 修复getBoundAccountName方法未定义错误
- 添加删除账户前的API Key绑定检查
- 完全保留原有粘性会话机制

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/routes/admin.js

@@ -78,9 +78,9 @@ router.post('/api-keys', authenticateAdmin, async (req, res) => {
 router.put('/api-keys/:keyId', authenticateAdmin, async (req, res) => {
   try {
     const { keyId } = req.params;
-    const { tokenLimit, concurrencyLimit } = req.body;
+    const { tokenLimit, concurrencyLimit, claudeAccountId } = req.body;
 
-    // 只允许更新tokenLimit和concurrencyLimit
+    // 只允许更新tokenLimit、concurrencyLimit和claudeAccountId
     const updates = {};
     
     if (tokenLimit !== undefined && tokenLimit !== null && tokenLimit !== '') {
@@ -97,6 +97,11 @@ router.put('/api-keys/:keyId', authenticateAdmin, async (req, res) => {
       updates.concurrencyLimit = Number(concurrencyLimit);
     }
 
+    if (claudeAccountId !== undefined) {
+      // 空字符串表示解绑，null或空字符串都设置为空字符串
+      updates.claudeAccountId = claudeAccountId || '';
+    }
+
     await apiKeyService.updateApiKey(keyId, updates);
     
     logger.success(`📝 Admin updated API key: ${keyId}`);
@@ -244,13 +249,19 @@ router.post('/claude-accounts', authenticateAdmin, async (req, res) => {
       password,
       refreshToken,
       claudeAiOauth,
-      proxy
+      proxy,
+      accountType
     } = req.body;
 
     if (!name) {
       return res.status(400).json({ error: 'Name is required' });
     }
 
+    // 验证accountType的有效性
+    if (accountType && !['shared', 'dedicated'].includes(accountType)) {
+      return res.status(400).json({ error: 'Invalid account type. Must be "shared" or "dedicated"' });
+    }
+
     const newAccount = await claudeAccountService.createAccount({
       name,
       description,
@@ -258,10 +269,11 @@ router.post('/claude-accounts', authenticateAdmin, async (req, res) => {
       password,
       refreshToken,
       claudeAiOauth,
-      proxy
+      proxy,
+      accountType: accountType || 'shared' // 默认为共享类型
     });
 
-    logger.success(`🏢 Admin created new Claude account: ${name}`);
+    logger.success(`🏢 Admin created new Claude account: ${name} (${accountType || 'shared'})`);
     res.json({ success: true, data: newAccount });
   } catch (error) {
     logger.error('❌ Failed to create Claude account:', error);