init：代码初始化

src/server.js

@@ -0,0 +1,56 @@
+require('dotenv').config();
+const createApp = require('./app');
+
+/**
+ * 启动服务器
+ */
+function startServer() {
+  const app = createApp();
+  const PORT = process.env.PORT || 3000;
+
+  const server = app.listen(PORT, () => {
+    console.log('='.repeat(60));
+    console.log('🚀 Steel Prices Service 已启动');
+    console.log('='.repeat(60));
+    console.log(`📍 服务地址: http://localhost:${PORT}`);
+    console.log(`📍 Swagger文档地址: http://localhost:${PORT}/api-docs`);
+    console.log(`🌍 环境: ${process.env.NODE_ENV || 'development'}`);
+    console.log(`📊 API 文档: http://localhost:${PORT}/`);
+    console.log('='.repeat(60));
+  });
+
+  // 优雅关闭
+  const gracefulShutdown = (signal) => {
+    console.log(`\n${signal} 信号收到，正在关闭服务器...`);
+    server.close(() => {
+      console.log('✅ 服务器已关闭');
+      process.exit(0);
+    });
+
+    // 10秒后强制关闭
+    setTimeout(() => {
+      console.error('❌ 强制关闭服务器');
+      process.exit(1);
+    }, 10000);
+  };
+
+  process.on('SIGTERM', () => gracefulShutdown('SIGTERM'));
+  process.on('SIGINT', () => gracefulShutdown('SIGINT'));
+
+  // 未捕获的异常
+  process.on('unhandledRejection', (reason, promise) => {
+    console.error('❌ 未处理的 Promise 拒绝:', reason);
+  });
+
+  process.on('uncaughtException', (error) => {
+    console.error('❌ 未捕获的异常:', error);
+    process.exit(1);
+  });
+}
+
+// 如果直接运行此文件
+if (require.main === module) {
+  startServer();
+}
+
+module.exports = startServer;