Create comprehensive deployment instructions (Coolify + Neon

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Create comprehensive deployment instructions (Coolify + Neon Postgres + proper Dockerfile)

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Description

**Goal:** Create comprehensive deployment documentation for this Tinker Planner application.

**Tech Stack:**
- **Coolify:** Self-hosted Vercel/Netlify alternative for deployment
- **Neon Postgres:** Cloud-hosted PostgreSQL (serverless, branching)
- **Docker:** Application should have proper Dockerfile

**What needs to be documented:**

1. **Dockerfile improvements** (if needed)
   - Multi-stage build for production
   - Proper asset precompilation
   - Database migrations on startup
   - Environment variable handling
   - Health check endpoints

2. **Coolify deployment guide**
   - How to connect Coolify to the codebase
   - Environment variables required (list all env vars)
   - Database connection setup for Neon
   - Domain/SSL configuration
   - Worker processes (background jobs)
   - Redis configuration (if needed)

3. **Neon Postgres setup**
   - Creating a Neon project
   - Getting connection strings
   - Database migrations
   - Backups/branching (Neon features)

4. **Production checklist**
   - SECRET_KEY_BASE generation
   - RAILS_ENV=production
   - Asset serving (CDN vs local)
   - Log aggregation
   - Error tracking (Sentry?)

**Deliverable:** 
A markdown file (e.g., `DEPLOYMENT.md`) or section in README with step-by-step instructions.