实现listExperiments端点和通用转发机制

- 添加forwardToCodeAssist通用转发函数支持简单端点
- 添加handleSimpleEndpoint通用路由处理函数
- 注册listExperiments路由(v1internal和v1beta)
- 解决gemini-cli启动时404 Not Found错误

src/routes/geminiRoutes.js

@@ -349,6 +349,65 @@ router.get('/key-info', authenticateApiKey, async (req, res) => {
   }
 })
 
+// 通用的简单端点处理函数（用于直接转发的端点）
+// 适用于：listExperiments 等不需要特殊业务逻辑的端点
+async function handleSimpleEndpoint(apiMethod) {
+  return async (req, res) => {
+    try {
+      if (!ensureGeminiPermission(req, res)) {
+        return undefined
+      }
+
+      const sessionHash = sessionHelper.generateSessionHash(req.body)
+
+      // 从路径参数或请求体中获取模型名
+      const requestedModel = req.body.model || req.params.modelName || 'gemini-2.5-flash'
+      const { accountId } = await unifiedGeminiScheduler.selectAccountForApiKey(
+        req.apiKey,
+        sessionHash,
+        requestedModel
+      )
+      const account = await geminiAccountService.getAccount(accountId)
+      const { accessToken, refreshToken } = account
+
+      const version = req.path.includes('v1beta') ? 'v1beta' : 'v1internal'
+      logger.info(`${apiMethod} request (${version})`, {
+        apiKeyId: req.apiKey?.id || 'unknown',
+        requestBody: req.body
+      })
+
+      // 解析账户的代理配置
+      let proxyConfig = null
+      if (account.proxy) {
+        try {
+          proxyConfig = typeof account.proxy === 'string' ? JSON.parse(account.proxy) : account.proxy
+        } catch (e) {
+          logger.warn('Failed to parse proxy configuration:', e)
+        }
+      }
+
+      const client = await geminiAccountService.getOauthClient(accessToken, refreshToken, proxyConfig)
+
+      // 直接转发请求体，不做特殊处理
+      const response = await geminiAccountService.forwardToCodeAssist(
+        client,
+        apiMethod,
+        req.body,
+        proxyConfig
+      )
+
+      res.json(response)
+    } catch (error) {
+      const version = req.path.includes('v1beta') ? 'v1beta' : 'v1internal'
+      logger.error(`Error in ${apiMethod} endpoint (${version})`, { error: error.message })
+      res.status(500).json({
+        error: 'Internal server error',
+        message: error.message
+      })
+    }
+  }
+}
+
 // 共用的 loadCodeAssist 处理函数
 async function handleLoadCodeAssist(req, res) {
   try {
@@ -1040,6 +1099,7 @@ router.post('/v1internal\\:onboardUser', authenticateApiKey, handleOnboardUser)
 router.post('/v1internal\\:countTokens', authenticateApiKey, handleCountTokens)
 router.post('/v1internal\\:generateContent', authenticateApiKey, handleGenerateContent)
 router.post('/v1internal\\:streamGenerateContent', authenticateApiKey, handleStreamGenerateContent)
+router.post('/v1internal\\:listExperiments', authenticateApiKey, handleSimpleEndpoint('listExperiments'))
 
 // v1beta 版本的端点 - 支持动态模型名称
 router.post('/v1beta/models/:modelName\\:loadCodeAssist', authenticateApiKey, handleLoadCodeAssist)
@@ -1055,6 +1115,11 @@ router.post(
   authenticateApiKey,
   handleStreamGenerateContent
 )
+router.post(
+  '/v1beta/models/:modelName\\:listExperiments',
+  authenticateApiKey,
+  handleSimpleEndpoint('listExperiments')
+)
 
 // 导出处理函数供标准路由使用
 module.exports = router

src/services/geminiAccountService.js

@@ -1060,6 +1060,47 @@ async function getOauthClient(accessToken, refreshToken, proxyConfig = null) {
   return client
 }
 
+// 通用的 Code Assist API 转发函数（用于简单的请求/响应端点）
+// 适用于：loadCodeAssist, onboardUser, countTokens, listExperiments 等不需要特殊处理的端点
+async function forwardToCodeAssist(client, apiMethod, requestBody, proxyConfig = null) {
+  const axios = require('axios')
+  const CODE_ASSIST_ENDPOINT = 'https://cloudcode-pa.googleapis.com'
+  const CODE_ASSIST_API_VERSION = 'v1internal'
+
+  const { token } = await client.getAccessToken()
+  const proxyAgent = ProxyHelper.createProxyAgent(proxyConfig)
+
+  logger.info(`📡 ${apiMethod} API调用开始`)
+
+  const axiosConfig = {
+    url: `${CODE_ASSIST_ENDPOINT}/${CODE_ASSIST_API_VERSION}:${apiMethod}`,
+    method: 'POST',
+    headers: {
+      Authorization: `Bearer ${token}`,
+      'Content-Type': 'application/json'
+    },
+    data: requestBody,
+    timeout: 30000
+  }
+
+  // 添加代理配置
+  if (proxyAgent) {
+    axiosConfig.httpAgent = proxyAgent
+    axiosConfig.httpsAgent = proxyAgent
+    axiosConfig.proxy = false
+    logger.info(
+      `🌐 Using proxy for ${apiMethod}: ${ProxyHelper.getProxyDescription(proxyConfig)}`
+    )
+  } else {
+    logger.debug(`🌐 No proxy configured for ${apiMethod}`)
+  }
+
+  const response = await axios(axiosConfig)
+
+  logger.info(`✅ ${apiMethod} API调用成功`)
+  return response.data
+}
+
 // 调用 Google Code Assist API 的 loadCodeAssist 方法（支持代理）
 async function loadCodeAssist(client, projectId = null, proxyConfig = null) {
   const axios = require('axios')
@@ -1529,6 +1570,7 @@ module.exports = {
   getAccountRateLimitInfo,
   isTokenExpired,
   getOauthClient,
+  forwardToCodeAssist, // 通用转发函数
   loadCodeAssist,
   getOnboardTier,
   onboardUser,