feat: 初始化Node.js 4G短信网关项目

- 实现AT指令通信和4G模组管理
- 支持PDU模式短信接收和发送
- 长短信自动合并功能
- 多通道推送支持（钉钉/飞书/Telegram等）
- 管理员短信远程控制
- RESTful API接口
- 完整的日志系统

package.json

@@ -0,0 +1,35 @@
+{
+  "name": "nodejs-sms-gateway",
+  "version": "1.0.0",
+  "description": "4G SMS Gateway with AT command communication",
+  "main": "src/index.js",
+  "type": "module",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "nodemon src/index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "sms",
+    "4g",
+    "at-commands",
+    "gateway",
+    "modem"
+  ],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "serialport": "^12.0.0",
+    "@serialport/parser-readline": "^12.0.0",
+    "node-pdu": "^0.2.1",
+    "express": "^4.18.2",
+    "express-basic-auth": "^1.2.1",
+    "nodemailer": "^6.9.7",
+    "axios": "^1.6.2",
+    "winston": "^3.11.0",
+    "dotenv": "^16.3.1"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.2"
+  }
+}