feat: add graceful shutdown handling (SIGTERM/SIGINT)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/server.ts

@@ -2,6 +2,7 @@ import Fastify from 'fastify';
 import cors from '@fastify/cors';
 import cookie from '@fastify/cookie';
 import rateLimit from '@fastify/rate-limit';
+import path from 'path';
 import { config } from './config/env';
 import { securityHeaders } from './middleware/security';
 
@@ -129,6 +130,23 @@ async function start() {
     });
   }
 
+  // --- Frontend: static file serving (production) ---
+  if (config.isProduction) {
+    const fastifyStatic = (await import('@fastify/static')).default;
+    await app.register(fastifyStatic, {
+      root: path.join(__dirname, '..', 'dist-client'),
+      prefix: '/',
+      wildcard: false,
+    });
+
+    app.setNotFoundHandler((request, reply) => {
+      if (request.url.startsWith('/api/')) {
+        return reply.status(404).send({ success: false, error: 'Not found' });
+      }
+      return reply.sendFile('index.html');
+    });
+  }
+
   // --- Start ---
   const port = config.isProduction ? config.port : 3000;
   try {
@@ -138,6 +156,23 @@ async function start() {
     app.log.error(err);
     process.exit(1);
   }
+
+  const shutdown = async (signal: string) => {
+    app.log.info(`${signal} received, shutting down gracefully...`);
+    try {
+      await app.close();
+      const { default: prisma } = await import('./config/database');
+      await prisma.$disconnect();
+      app.log.info('Server shut down successfully');
+      process.exit(0);
+    } catch (err) {
+      app.log.error(err, 'Error during shutdown');
+      process.exit(1);
+    }
+  };
+
+  process.on('SIGTERM', () => shutdown('SIGTERM'));
+  process.on('SIGINT', () => shutdown('SIGINT'));
 }
 
 start();