feat: 班级小助手 阶段1-3（monorepo + 后端 REST/Socket.IO + Web 管理端）

packages/server/src/index.ts

@@ -0,0 +1,46 @@
+import { createServer } from 'node:http';
+import { API_PREFIX } from '@classhelper/shared';
+import { createApp } from './app.js';
+import { env } from './config/env.js';
+import { disconnectPrisma, pingDatabase } from './lib/db.js';
+import { logger } from './lib/logger.js';
+import { initRealtime } from './realtime/socket.js';
+
+const app = createApp();
+const httpServer = createServer(app);
+const io = initRealtime(httpServer);
+
+if (!(await pingDatabase())) {
+  logger.warn('数据库连接失败：请先执行 pnpm db:migrate 与 pnpm db:seed');
+}
+
+httpServer.listen(env.port, () => {
+  logger.info(`班级小助手后端已启动：http://127.0.0.1:${env.port}${API_PREFIX}`);
+  logger.info(`健康检查：http://127.0.0.1:${env.port}${API_PREFIX}/health`);
+  logger.info(`WebSocket：ws://127.0.0.1:${env.port}/socket.io`);
+  logger.info(`运行环境：${env.nodeEnv}，数据库：${env.databaseProvider}`);
+});
+
+let shuttingDown = false;
+
+async function shutdown(signal: string): Promise<void> {
+  if (shuttingDown) return;
+  shuttingDown = true;
+  logger.info(`收到 ${signal}，正在优雅关闭...`);
+
+  await new Promise<void>((resolve) => io.close(() => resolve()));
+  await new Promise<void>((resolve) => httpServer.close(() => resolve()));
+  await disconnectPrisma();
+  logger.info('已关闭所有连接');
+  process.exit(0);
+}
+
+process.on('SIGINT', () => {
+  void shutdown('SIGINT');
+});
+process.on('SIGTERM', () => {
+  void shutdown('SIGTERM');
+});
+process.on('unhandledRejection', (reason) => {
+  logger.error('未处理的 Promise 拒绝', reason);
+});