feat: migrate from express to fastify

src/tools/plugins/socket-io.ts

@@ -0,0 +1,19 @@
+import fastifyPlugin from 'fastify-plugin'
+import { Server as SocketIoServer, ServerOptions } from 'socket.io'
+
+declare module 'fastify' {
+  export interface FastifyInstance {
+    io: SocketIoServer
+  }
+}
+
+export default fastifyPlugin(
+  async (fastify, options: Partial<ServerOptions>) => {
+    const socket = new SocketIoServer(fastify.server, options)
+    fastify.decorate('io', socket)
+    fastify.addHook('onClose', async (fastify) => {
+      fastify.io.close()
+    })
+  },
+  { fastify: '3.x' }
+)