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

src/api.js

@@ -0,0 +1,209 @@
+import express from 'express';
+import basicAuth from 'express-basic-auth';
+import logger from './logger.js';
+
+class APIServer {
+  constructor(config, modem, smsProcessor) {
+    this.config = config;
+    this.modem = modem;
+    this.smsProcessor = smsProcessor;
+    this.app = express();
+
+    this.setupMiddleware();
+    this.setupRoutes();
+  }
+
+  setupMiddleware() {
+    // JSON解析
+    this.app.use(express.json());
+
+    // HTTP Basic认证
+    const users = {};
+    users[this.config.api.auth.username] = this.config.api.auth.password;
+
+    this.app.use(basicAuth({
+      users,
+      challenge: true,
+      realm: 'SMS Gateway'
+    }));
+
+    // 请求日志
+    this.app.use((req, res, next) => {
+      logger.info(`${req.method} ${req.path}`);
+      next();
+    });
+  }
+
+  setupRoutes() {
+    // 状态查询
+    this.app.get('/api/status', async (req, res) => {
+      try {
+        const signal = await this.modem.getSignalQuality();
+        const operator = await this.modem.getOperator();
+
+        res.json({
+          success: true,
+          data: {
+            ready: this.modem.ready,
+            model: this.modem.modelInfo,
+            signal,
+            operator,
+            uptime: process.uptime()
+          }
+        });
+      } catch (err) {
+        logger.error('查询状态失败:', err);
+        res.status(500).json({
+          success: false,
+          error: err.message
+        });
+      }
+    });
+
+    // 发送短信
+    this.app.post('/api/sms/send', async (req, res) => {
+      try {
+        const { phone, message } = req.body;
+
+        if (!phone || !message) {
+          return res.status(400).json({
+            success: false,
+            error: '缺少必要参数: phone, message'
+          });
+        }
+
+        const success = await this.modem.sendSMS(phone, message);
+
+        res.json({
+          success,
+          message: success ? '短信发送成功' : '短信发送失败'
+        });
+      } catch (err) {
+        logger.error('发送短信失败:', err);
+        res.status(500).json({
+          success: false,
+          error: err.message
+        });
+      }
+    });
+
+    // 查询信号强度
+    this.app.get('/api/modem/signal', async (req, res) => {
+      try {
+        const signal = await this.modem.getSignalQuality();
+        res.json({
+          success: true,
+          data: signal
+        });
+      } catch (err) {
+        logger.error('查询信号失败:', err);
+        res.status(500).json({
+          success: false,
+          error: err.message
+        });
+      }
+    });
+
+    // 查询模组信息
+    this.app.get('/api/modem/info', async (req, res) => {
+      try {
+        const iccid = await this.modem.getICCID();
+        res.json({
+          success: true,
+          data: {
+            model: this.modem.modelInfo,
+            iccid,
+            ready: this.modem.ready
+          }
+        });
+      } catch (err) {
+        logger.error('查询模组信息失败:', err);
+        res.status(500).json({
+          success: false,
+          error: err.message
+        });
+      }
+    });
+
+    // 发送AT命令
+    this.app.post('/api/modem/at', async (req, res) => {
+      try {
+        const { command } = req.body;
+
+        if (!command) {
+          return res.status(400).json({
+            success: false,
+            error: '缺少必要参数: command'
+          });
+        }
+
+        const response = await this.modem.sendATCommand(command, 5000);
+
+        res.json({
+          success: true,
+          data: {
+            command,
+            response
+          }
+        });
+      } catch (err) {
+        logger.error('发送AT命令失败:', err);
+        res.status(500).json({
+          success: false,
+          error: err.message
+        });
+      }
+    });
+
+    // 获取日志
+    this.app.get('/api/logs', (req, res) => {
+      try {
+        const logs = logger.getBuffer().getAll();
+        res.json({
+          success: true,
+          data: logs
+        });
+      } catch (err) {
+        logger.error('获取日志失败:', err);
+        res.status(500).json({
+          success: false,
+          error: err.message
+        });
+      }
+    });
+
+    // 健康检查
+    this.app.get('/health', (req, res) => {
+      res.json({
+        status: 'ok',
+        uptime: process.uptime()
+      });
+    });
+
+    // 404处理
+    this.app.use((req, res) => {
+      res.status(404).json({
+        success: false,
+        error: 'Not Found'
+      });
+    });
+
+    // 错误处理
+    this.app.use((err, req, res, next) => {
+      logger.error('API错误:', err);
+      res.status(500).json({
+        success: false,
+        error: err.message
+      });
+    });
+  }
+
+  start() {
+    const port = this.config.api.port;
+    this.app.listen(port, () => {
+      logger.info(`API服务器已启动，监听端口: ${port}`);
+    });
+  }
+}
+
+export default APIServer;