refactor(api): 将健康检查和令牌计数处理逻辑移至请求处理器

重构代码结构，将原本在api-manager.js中的健康检查端点和令牌计数请求处理

src/api-manager.js

@@ -18,27 +18,7 @@ import {
  * @returns {Promise<boolean>} - True if the request was handled by API
  */
 export async function handleAPIRequests(method, path, req, res, currentConfig, apiService, providerPoolManager, promptLogFilename) {
-    // Health check endpoint
-    if (method === 'GET' && path === '/health') {
-        res.writeHead(200, { 'Content-Type': 'application/json' });
-        res.end(JSON.stringify({
-            status: 'healthy',
-            timestamp: new Date().toISOString(),
-            provider: currentConfig.MODEL_PROVIDER
-        }));
-        return true;
-    }
 
-    // Ignore count_tokens requests
-    if (path.includes('/count_tokens')) {
-        console.log(`[Server] Ignoring count_tokens request: ${path}`);
-        res.writeHead(200, { 'Content-Type': 'application/json' });
-        res.end(JSON.stringify({
-            tokens: 0,
-            message: 'Token counting is not supported'
-        }));
-        return true;
-    }
 
     // Route model list requests
     if (method === 'GET') {

src/request-handler.js

@@ -80,6 +80,28 @@ export function createRequestHandler(config, providerPoolManager) {
             }
             return;
         }
+        
+        // Health check endpoint
+        if (method === 'GET' && path === '/health') {
+            res.writeHead(200, { 'Content-Type': 'application/json' });
+            res.end(JSON.stringify({
+                status: 'healthy',
+                timestamp: new Date().toISOString(),
+                provider: currentConfig.MODEL_PROVIDER
+            }));
+            return true;
+        }
+
+        // Ignore count_tokens requests
+        if (path.includes('/count_tokens')) {
+            console.log(`[Server] Ignoring count_tokens request: ${path}`);
+            res.writeHead(200, { 'Content-Type': 'application/json' });
+            res.end(JSON.stringify({
+                tokens: 0,
+                message: 'Token counting is not supported'
+            }));
+            return true;
+        }
 
         // Check authentication for API requests
         if (!isAuthorized(req, requestUrl, currentConfig.REQUIRED_API_KEY)) {