feat(stream_chat_demo): 添加API URL配置功能

在流式聊天测试Demo中添加API URL配置面板，支持自定义和保存API地址

src/addon/aikefu/docs/stream_chat_demo.html

@@ -104,6 +104,77 @@
             cursor: not-allowed;
         }
 
+        .api-config {
+            margin-bottom: 20px;
+            padding: 15px;
+            border: 1px solid #ddd;
+            border-radius: 4px;
+            background-color: #f8f9fa;
+        }
+
+        .api-config h3 {
+            margin-top: 0;
+            margin-bottom: 10px;
+            color: #333;
+        }
+
+        .input-group {
+            display: flex;
+            gap: 10px;
+            align-items: center;
+            flex-wrap: wrap;
+        }
+
+        .input-group label {
+            font-size: 14px;
+            color: #666;
+            white-space: nowrap;
+        }
+
+        .input-group input {
+            flex: 1;
+            min-width: 300px;
+            padding: 8px;
+            border: 1px solid #ddd;
+            border-radius: 4px;
+            font-size: 14px;
+        }
+
+        #save-api-url {
+            padding: 8px 16px;
+            background-color: #28a745;
+            color: white;
+            border: none;
+            border-radius: 4px;
+            cursor: pointer;
+            font-size: 14px;
+        }
+
+        #save-api-url:hover {
+            background-color: #218838;
+        }
+
+        #reset-api-url {
+            padding: 8px 16px;
+            background-color: #6c757d;
+            color: white;
+            border: none;
+            border-radius: 4px;
+            cursor: pointer;
+            font-size: 14px;
+        }
+
+        #reset-api-url:hover {
+            background-color: #5a6268;
+        }
+
+        .config-hint {
+            font-size: 12px;
+            color: #666;
+            margin-top: 5px;
+            margin-bottom: 0;
+        }
+
         .status {
             margin-top: 10px;
             font-size: 12px;
@@ -117,6 +188,17 @@
     <div class="container">
         <h1>流式聊天测试 Demo</h1>
 
+        <div class="api-config">
+            <h3>API 配置</h3>
+            <div class="input-group">
+                <label for="api-url-input">API URL:</label>
+                <input type="text" id="api-url-input" placeholder="输入完整 API URL 或仅域名（默认添加 /api/kefu/chat）">
+                <button id="save-api-url">保存</button>
+                <button id="reset-api-url">重置默认</button>
+            </div>
+            <p class="config-hint">提示：您可以只修改域名部分（如 http://localhost:8050），系统会自动添加默认路径 /api/kefu/chat</p>
+        </div>
+
         <div class="method-selector">
             <h3>选择请求方式：</h3>
             <button class="method-btn active" data-method="eventsource">EventSource</button>
@@ -137,7 +219,7 @@
 
     <script>
         // 配置
-        const API_URL = 'http://localhost:8050/api/kefu/chat';
+        let API_URL = localStorage.getItem('apiUrl') || 'http://localhost:8050/api/kefu/chat';
         const UNIACID = '1';
         let conversationId = '';
         let currentMethod = 'eventsource';
@@ -150,6 +232,9 @@
         const sendBtn = document.getElementById('send-btn');
         const statusText = document.getElementById('status-text');
         const methodBtns = document.querySelectorAll('.method-btn');
+        const apiUrlInput = document.getElementById('api-url-input');
+        const saveApiUrlBtn = document.getElementById('save-api-url');
+        const resetApiUrlBtn = document.getElementById('reset-api-url');
 
         // 事件监听
         messageInput.addEventListener('keypress', (e) => {
@@ -169,6 +254,40 @@
             });
         });
 
+        // API URL 保存事件
+        saveApiUrlBtn.addEventListener('click', () => {
+            let newApiUrl = apiUrlInput.value.trim();
+            if (newApiUrl) {
+                // 检查是否只输入了域名（没有 /api/kefu/chat 路径）
+                if (!newApiUrl.includes('/api/kefu/chat')) {
+                    // 确保域名末尾没有斜杠
+                    newApiUrl = newApiUrl.replace(/\/$/, '') + '/api/kefu/chat';
+                }
+                localStorage.setItem('apiUrl', newApiUrl);
+                API_URL = newApiUrl;
+                // 更新输入框显示完整 URL
+                apiUrlInput.value = newApiUrl;
+                statusText.textContent = 'API URL 已保存';
+                setTimeout(() => {
+                    statusText.textContent = '就绪';
+                }, 2000);
+            }
+        });
+
+        // 重置默认 API URL
+        resetApiUrlBtn.addEventListener('click', () => {
+            const defaultApiUrl = 'http://localhost:8050/api/kefu/chat';
+            localStorage.setItem('apiUrl', defaultApiUrl);
+            API_URL = defaultApiUrl;
+            apiUrlInput.value = defaultApiUrl;
+            statusText.textContent = '已重置为默认 API URL';
+            setTimeout(() => {
+                statusText.textContent = '就绪';
+            }, 2000);
+        });
+
+
+
         // 发送消息
         function sendMessage() {
             const message = messageInput.value.trim();
@@ -468,6 +587,7 @@
         });
 
         // 初始化
+        apiUrlInput.value = API_URL;
         statusText.textContent = '就绪，使用 EventSource 方式';
     </script>
 </body>