diff --git a/backend-integration/api-proxy.js b/backend-integration/api-proxy.js
index b14c03cb..611f0cd2 100644
--- a/backend-integration/api-proxy.js
+++ b/backend-integration/api-proxy.js
@@ -40,7 +40,7 @@ const { URL } = require('url');
 // 配置
 // ═══════════════════════════════════════════════════════
 const PORT = parseInt(process.env.PROXY_PORT || '3721', 10);
-const ALLOWED_ORIGINS = (process.env.ALLOWED_ORIGINS || '*').split(',').map(s => s.trim());
+const ALLOWED_ORIGINS = (process.env.ALLOWED_ORIGINS || 'https://qinfendebingshuo.github.io,https://guanghulab.com,http://localhost:8765').split(',').map(s => s.trim());
 const RATE_LIMIT_RPM = parseInt(process.env.RATE_LIMIT_RPM || '10', 10);
 
 // 模型端点映射
@@ -243,8 +243,8 @@ function proxyStream(upstreamUrl, apiKey, requestBody, res) {
       reject(err);
     });
 
-    // Set timeout (30 seconds for connection, but streaming can be longer)
-    upstream.setTimeout(30000, () => {
+    // Connection timeout only — once response headers arrive, streaming can run longer
+    upstream.setTimeout(60000, () => {
       upstream.destroy(new Error('连接超时'));
     });
 
@@ -312,6 +312,10 @@ async function handleChat(req, res) {
     return;
   }
 
+  // Validate numeric parameters
+  const temp = typeof temperature === 'number' ? Math.max(0, Math.min(2, temperature)) : 0.8;
+  const maxTok = typeof max_tokens === 'number' ? Math.max(1, Math.min(8192, Math.floor(max_tokens))) : 2000;
+
   // Determine provider
   const prov = provider || 'deepseek';
   const config = MODEL_CONFIG[prov];
@@ -341,8 +345,8 @@ async function handleChat(req, res) {
     model: mdl,
     messages: messages,
     stream: stream !== false, // Default to streaming
-    temperature: temperature ?? 0.8,
-    max_tokens: max_tokens ?? 2000
+    temperature: temp,
+    max_tokens: maxTok
   };
 
   // If system prompt provided, prepend as system message
@@ -352,7 +356,7 @@ async function handleChat(req, res) {
 
   const upstreamUrl = config.base + '/chat/completions';
 
-  console.log(`[代理] ${clientId} → ${prov}/${mdl} (${messages.length}条消息)`);
+  console.log(`[代理] ${prov}/${mdl}`);
 
   try {
     await proxyStream(upstreamUrl, apiKey, upstreamBody, res);
diff --git a/backend-integration/nginx-api-proxy.conf b/backend-integration/nginx-api-proxy.conf
index d326c6b9..cc36436b 100644
--- a/backend-integration/nginx-api-proxy.conf
+++ b/backend-integration/nginx-api-proxy.conf
@@ -20,7 +20,7 @@ location /api/ {
     proxy_cache off;
     chunked_transfer_encoding on;
 
-    # 长连接超时（AI 生成可能需要较长时间）
-    proxy_read_timeout 120s;
-    proxy_send_timeout 120s;
+    # 长连接超时（与 Node.js api-proxy 的 60s 连接超时对齐，流式响应可更长）
+    proxy_read_timeout 90s;
+    proxy_send_timeout 60s;
 }
diff --git a/docs/index.html b/docs/index.html
index 5cacc221..c1c4cf94 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -323,13 +323,13 @@ footer{padding:12px 18px 16px;background:var(--s1);border-top:1px solid var(--bo
   <div class="fg">
     <label>选择 AI 提供商</label>
     <select id="sp" onchange="onProv(this.value,'s')">
-      <option value="proxy">🔌 后端代理（国内直连·推荐）</option>
       <option value="yunwu">☁️ 云雾 AI（团队推荐）</option>
-      <option value="openai">OpenAI (ChatGPT)</option>
-      <option value="gemini">🔮 Google Gemini</option>
       <option value="deepseek">DeepSeek（深度求索·国内直连）</option>
+      <option value="proxy">🔌 后端代理（guanghulab.com）</option>
       <option value="moonshot">Moonshot（Kimi·国内直连）</option>
       <option value="zhipu">智谱 AI（GLM·国内直连）</option>
+      <option value="openai">OpenAI (ChatGPT)</option>
+      <option value="gemini">🔮 Google Gemini</option>
       <option value="custom">自定义 / 其他兼容接口</option>
     </select>
   </div>
@@ -515,13 +515,13 @@ footer{padding:12px 18px 16px;background:var(--s1);border-top:1px solid var(--bo
     <div class="sfg">
       <label>AI 提供商</label>
       <select id="cp" onchange="onProv(this.value,'c')">
-        <option value="proxy">🔌 后端代理（国内直连·推荐）</option>
         <option value="yunwu">☁️ 云雾 AI（团队推荐）</option>
-        <option value="openai">OpenAI (ChatGPT)</option>
-        <option value="gemini">🔮 Google Gemini</option>
         <option value="deepseek">DeepSeek（深度求索·国内直连）</option>
+        <option value="proxy">🔌 后端代理（guanghulab.com）</option>
         <option value="moonshot">Moonshot（Kimi·国内直连）</option>
         <option value="zhipu">智谱 AI（GLM·国内直连）</option>
+        <option value="openai">OpenAI (ChatGPT)</option>
+        <option value="gemini">🔮 Google Gemini</option>
         <option value="custom">自定义</option>
       </select>
     </div>
@@ -1188,7 +1188,7 @@ function onProv(pv,ctx){
   }
   // Proxy mode: API key is optional (managed server-side)
   const ki = document.getElementById(keyInp);
-  if(ki) ki.placeholder = isProxy ? '后端代理模式 — 无需填写 API 密钥（服务器端统一管理）' : (ctx==='s'?'粘贴任意 API 密钥，点击右侧按钮自动识别提供商和模型':'留空 = 保持当前密钥不变；粘贴新密钥即替换');
+  if(ki) ki.placeholder = isProxy ? '后端代理模式（无需密钥）' : (ctx==='s'?'粘贴任意 API 密钥，点击右侧按钮自动识别提供商和模型':'留空 = 保持当前密钥不变；粘贴新密钥即替换');
 }
 
 function fillModels(selId, pv, cur){
@@ -1584,9 +1584,10 @@ async function streamReply(txt){
     const url = isProxy ? (A.base+'/chat') : (A.base+'/chat/completions');
     const headers = {'Content-Type':'application/json'};
     if(!isProxy && A.key) headers['Authorization'] = 'Bearer '+A.key;
+    const allMsgs = [{role:'system',content:sysPrompt()},...A.msgs];
     const reqBody = isProxy
-      ? {provider:A.prov==='proxy'?undefined:A.prov, model:A.mdl, messages:[{role:'system',content:sysPrompt()},...A.msgs], stream:true, temperature:0.8, max_tokens:2000, system:sysPrompt()}
-      : {model:A.mdl, messages:[{role:'system',content:sysPrompt()},...A.msgs], stream:true, temperature:0.8, max_tokens:2000};
+      ? {model:A.mdl, messages:allMsgs, stream:true, temperature:0.8, max_tokens:2000}
+      : {model:A.mdl, messages:allMsgs, stream:true, temperature:0.8, max_tokens:2000};
     const res=await fetch(url,{
       method:'POST',
       headers:headers,