Add Express.js REST API server with ZenStack integration

[Copilot]

Adds Express.js backend with REST API endpoints for the ZenStack v3 quick start project.

Changes

Dependencies

• Added express and @types/express

REST API (main.ts)

• GET / - Health check endpoint
• GET /api/users - Returns users with nested posts
• GET /api/posts - Returns posts with author relations
• GET /api/posts/:id - Returns single post with validation

Implementation Details

• Database seeded on startup with createUsersAndPosts()
• Input validation on ID parameter (rejects NaN, negatives)
• Error logging with generic client-facing messages
• Port configurable via PORT environment variable (defaults to 3000)

app.get('/api/posts/:id', async (req, res) => {
  const id = parseInt(req.params.id);
  if (isNaN(id) || id < 1) {
    res.status(400).json({ error: 'Invalid post ID' });
    return;
  }
  const post = await db.post.findUnique({
    where: { id },
    include: { author: true }
  });
  // ...
});

Original prompt

install express.js and create a simple backend app

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