docs: 更新README并添加华为云认证凭证文件

添加华为云AK/SK获取指南到README文档
新增credentials.csv文件用于存储认证信息

server/cert/credentials.csv

@@ -0,0 +1,2 @@
+User Name,Access Key Id,Secret Access Key
+"hid_4g9ydbgkwc1r19-",HPUAA6YLJPZRJC3H5GWM,QOM4wMxZavQZXCzOlWibwue8t9nNX0yHPkutlaLn

server/index.js

@@ -1,3 +1,5 @@
+require('dotenv').config();
+
 const express = require('express');
 const cors = require('cors');
 const crypto = require('crypto');

server/package.json

@@ -8,6 +8,7 @@
   },
   "dependencies": {
     "express": "^4.18.2",
-    "cors": "^2.8.5"
+    "cors": "^2.8.5",
+    "dotenv": "^16.3.1"
   }
 }