fix: 修复 Claude Code 伪装为 Factory CLI 的 403 错误

主要修改：
1. 过滤 anthropic-beta header 中的 Claude Code 特有标识
2. 删除 context_management 字段
3. 过滤所有 Claude Code 特有工具（Skill, EnterPlanMode 等）
4. 过滤所有 MCP 相关工具
5. 过滤 messages 内容中的 Claude Code 特征文本
6. 处理 system 字段中的 cache_control 和字符串替换
7. 添加认证容错机制，token 失效时降级到 client authorization

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

auth.js

@@ -239,26 +239,34 @@ function shouldRefresh() {
 export async function initializeAuth() {
   try {
     const authConfig = loadAuthConfig();
-    
+
     if (authConfig.type === 'factory_key') {
       // Using fixed FACTORY_API_KEY, no refresh needed
       logInfo('Auth system initialized with fixed API key');
     } else if (authConfig.type === 'refresh') {
       // Using refresh token mechanism
       currentRefreshToken = authConfig.value;
-      
-      // Always refresh on startup to get fresh token
-      await refreshApiKey();
-      logInfo('Auth system initialized with refresh token mechanism');
+
+      // Try to refresh on startup to get fresh token
+      try {
+        await refreshApiKey();
+        logInfo('Auth system initialized with refresh token mechanism');
+      } catch (refreshError) {
+        logError('Failed to refresh token on startup, falling back to client authorization', refreshError);
+        authSource = 'client';
+        logInfo('Auth system fallback to client authorization mode');
+      }
     } else {
       // Using client authorization, no setup needed
       logInfo('Auth system initialized for client authorization mode');
     }
-    
+
     logInfo('Auth system initialized successfully');
   } catch (error) {
     logError('Failed to initialize auth system', error);
-    throw error;
+    // Don't throw error, allow server to start with client authorization
+    authSource = 'client';
+    logInfo('Auth system fallback to client authorization mode');
   }
 }