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docs: comprehensive PostgreSQL setup guide and system architecture (#59)

* docs: fix database configuration inconsistencies and add comprehensive PostgreSQL setup guide

Fix critical documentation issues where setup instructions referenced SQLite
while the Prisma schema only supports PostgreSQL (migrated in commits 92d72c3
and 9427d10). New developers were unable to follow setup instructions.

## Issues Fixed

1. **Documentation Mismatch (CRITICAL)**
   - Documentation instructed users to use DATABASE_URL=file:./dev.db
   - Prisma schema requires PostgreSQL (provider = "postgresql")
   - Impact: New developers unable to set up project locally

2. **Missing Setup Guide (CRITICAL)**
   - No clear instructions for PostgreSQL installation
   - Docker Compose already configured but not documented
   - Three valid setup methods existed but were not explained

3. **Security Risk**
   - .env.example contained unclear credential placeholders
   - No separation between local dev and production configs

4. **Orphaned SQLite Files**
   - prisma/dev.db (184KB) still exists from pre-migration
   - Already in .gitignore, documented for manual cleanup

## Changes Made

### Documentation Updates
- CLAUDE.md: Complete Initial Setup rewrite with 3 PostgreSQL options
- CLAUDE.md: Fixed Architecture Overview (removed SQLite references)
- README.md: Updated Quick Start with PostgreSQL setup instructions
- README.md: Updated Tech Stack to reflect PostgreSQL-only architecture
- docs/DOCKER.md: Removed SQLite references, updated environment variables

### New Files
- QUICKSTART.md: Step-by-step guide for all 3 setup methods (Docker/Vercel/Manual)
- .env.local.example: Developer-friendly PostgreSQL configuration template
- docs/DATABASE_MIGRATION.md: Complete migration history and troubleshooting
- docs/FIXES_APPLIED.md: Comprehensive documentation of all fixes applied

### Environment Configuration
- .env.example: Updated with clear PostgreSQL options and security notes

## ... (continued)

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