支持Anthropic端点客户端x-api-key：\n- /v1/messages读取x-api-key并优先作为客户端授权传递\n- getAnthropicHeaders转发x-api-key并透传anthropic-version\n- CORS允许X-API-Key与anthropic-version

routes.js

@@ -257,10 +257,13 @@ async function handleDirectResponses(req, res) {
 
     logInfo(`Direct forwarding to ${model.type} endpoint: ${endpoint.base_url}`);
 
-    // Get API key
+    // Get API key - support client x-api-key for anthropic endpoint
     let authHeader;
     try {
-      authHeader = await getApiKey(req.headers.authorization);
+      const clientAuthFromXApiKey = req.headers['x-api-key']
+        ? `Bearer ${req.headers['x-api-key']}`
+        : null;
+      authHeader = await getApiKey(req.headers.authorization || clientAuthFromXApiKey);
     } catch (error) {
       logError('Failed to get API key', error);
       return res.status(500).json({