Environment Variable Setup Guide

Set up environment variable management for my [FRAMEWORK] project.

**Services I use:** [LIST — e.g., "PostgreSQL, Stripe, SendGrid, AWS S3, OpenAI"]
**Deployment:** [WHERE — e.g., "Vercel", "AWS", "Railway"]

Generate:
1. **.env.example** — every variable with a description comment and dummy value
2. **Validation schema** — runtime validation that fails fast on missing vars (use zod)
3. **Type-safe access** — a typed env config object (not raw process.env everywhere)
4. **.gitignore rules** — ensure no secrets leak
5. **Setup guide** — step-by-step for a new developer to get all keys

```typescript
// Example of what I want:
import { env } from '@/lib/env';
env.DATABASE_URL  // string (validated at startup)
env.STRIPE_SECRET // string (validated at startup)
```

For each variable:
- Name, description, where to get it
- Is it required or optional?
- Different values per environment (dev/staging/prod)?
- Client-safe (NEXT_PUBLIC_) or server-only?

Include a warning system that logs which optional vars are missing at startup without crashing.