feat(授权): 添加后端服务支持自动获取授权码

- 新增 server 目录包含后端服务，支持通过 AK/SK 或用户名密码认证获取授权码
- 添加前端 API 模块实现授权码获取功能
- 更新 UI 增加获取授权码按钮和输入框布局
- 完善 README 文档说明后端配置和启动流程

scripts/main.js

@@ -10,6 +10,7 @@
 
 // 导入 HwICSUiSdk
 import { HwICSUiSdk, ICSEventKey, InteractionMode, ConfigKey } from '../hwICSUiSdk/HwICSUiSdk.esm.js';
+import { fetchOnceCode } from './api.js';
 
 // ===== 全局状态 =====
 const state = {
@@ -31,6 +32,7 @@ const elements = {
     // 按钮
     initBtn: document.getElementById('initBtn'),
     destroyBtn: document.getElementById('destroyBtn'),
+    getOnceCodeBtn: document.getElementById('getOnceCodeBtn'),
     startChatBtn: document.getElementById('startChatBtn'),
     stopChatBtn: document.getElementById('stopChatBtn'),
     startSpeakBtn: document.getElementById('startSpeakBtn'),
@@ -408,6 +410,24 @@ async function toggleAudio() {
     }
 }
 
+async function handleGetOnceCode() {
+    try {
+        elements.getOnceCodeBtn.disabled = true;
+        elements.getOnceCodeBtn.textContent = '🔄 获取中...';
+        logger.info('正在获取授权码...');
+
+        const onceCode = await fetchOnceCode();
+        elements.onceCode.value = onceCode;
+        logger.info('授权码获取成功');
+
+    } catch (error) {
+        logger.error('获取授权码失败', error.message);
+    } finally {
+        elements.getOnceCodeBtn.disabled = false;
+        elements.getOnceCodeBtn.textContent = '🔑 获取授权码';
+    }
+}
+
 function clearLogs() {
     elements.logContainer.innerHTML = '';
     logger.info('日志已清空');
@@ -417,6 +437,7 @@ function clearLogs() {
 function bindEvents() {
     elements.initBtn.addEventListener('click', initializeSDK);
     elements.destroyBtn.addEventListener('click', destroySDK);
+    elements.getOnceCodeBtn.addEventListener('click', handleGetOnceCode);
 
     elements.startChatBtn.addEventListener('click', startChat);
     elements.stopChatBtn.addEventListener('click', stopChat);