feat: scaffold writing-platform Express + TypeScript backend

- Initialize npm project with express, cors, jsonwebtoken, dotenv, socket.io, openai, uuid
- Configure TypeScript with strict mode, ES2020 target, declarations and source maps
- Create src directory structure: routes/, middleware/, services/, models/
- Add minimal server.ts with health check at /api/writing/health (port 3100)
- Add .gitignore for node_modules, dist, .env

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

writing-platform/backend/.gitignore

@@ -0,0 +1,3 @@
+node_modules/
+dist/
+.env

writing-platform/backend/package.json

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+{
+  "name": "backend",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "dev": "nodemon --exec ts-node src/server.ts",
+    "build": "tsc",
+    "start": "node dist/server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "dependencies": {
+    "cors": "^2.8.6",
+    "dotenv": "^17.3.1",
+    "express": "^5.2.1",
+    "jsonwebtoken": "^9.0.3",
+    "openai": "^6.32.0",
+    "socket.io": "^4.8.3",
+    "uuid": "^13.0.0"
+  },
+  "devDependencies": {
+    "@types/cors": "^2.8.19",
+    "@types/express": "^5.0.6",
+    "@types/jsonwebtoken": "^9.0.10",
+    "@types/node": "^25.5.0",
+    "nodemon": "^3.1.14",
+    "ts-node": "^10.9.2",
+    "typescript": "^6.0.2"
+  }
+}

writing-platform/backend/src/server.ts

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+import express from 'express';
+import cors from 'cors';
+import http from 'http';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+const app = express();
+const server = http.createServer(app);
+
+app.use(cors());
+app.use(express.json());
+
+app.get('/api/writing/health', (_req, res) => {
+  res.json({
+    status: 'ok',
+    service: 'writing-platform-backend',
+    timestamp: new Date().toISOString(),
+  });
+});
+
+const PORT = process.env.PORT || 3100;
+
+server.listen(PORT, () => {
+  console.log(`Writing platform backend running on port ${PORT}`);
+});
+
+export { app, server };

writing-platform/backend/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "commonjs",
+    "lib": ["ES2020"],
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}