フロントエンドとバックエンドの連携とデプロイの節を追加

docs/4-advanced/05-integration-and-deployment/_samples/fullstack-app/backend/.env.sample

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+DATABASE_URL=""
+WEB_ORIGIN="http://localhost:5173"

docs/4-advanced/05-integration-and-deployment/_samples/fullstack-app/backend/.gitignore

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+/node_modules
+/.env
+/generated/prisma
+/dist

docs/4-advanced/05-integration-and-deployment/_samples/fullstack-app/backend/main.ts

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+import express from "express";
+import cors from "cors";
+import { PrismaClient } from "./generated/prisma/client.js";
+
+const app = express();
+const client = new PrismaClient();
+app.use(express.json());
+app.use(cors({ origin: process.env.WEB_ORIGIN }));
+
+app.get("/posts", async (request, response) => {
+  const posts = await client.post.findMany();
+  response.json(posts);
+});
+
+app.post("/send", async (request, response) => {
+  await client.post.create({ data: { message: request.body.message } });
+  response.send();
+});
+
+app.listen(3000);