docs: major repository restructure for GitHub public release

- Create comprehensive README.md optimized for GitHub/SEO
- Consolidate deployment instructions into single DEPLOYMENT.md
- Add all standard GitHub documentation files:
  - CONTRIBUTING.md with development guidelines
  - CODE_OF_CONDUCT.md for community standards
  - SECURITY.md with vulnerability reporting
  - CHANGELOG.md following Keep a Changelog format
- Simplify deployment with single docker-compose.yml
- Remove complex deployment configurations (Swarm, Traefik)
- Add backup script for easy maintenance
- Update .github-mirror-exclude to hide complex configs
- Remove redundant documentation files

This prepares PicPeak as a professional open-source alternative
to PicDrop and Scrapbook.de with clear, simple deployment.

.env.production.example

@@ -1,32 +1,44 @@
-# Production Environment Configuration Template
-# Copy this file to .env and fill in your values
+# PicPeak Production Configuration
+# Copy this file to .env and update with your values
 
-# Application URLs
-ADMIN_URL=https://yourdomain.com
-FRONTEND_URL=https://yourdomain.com
+# Required: Security
+JWT_SECRET=CHANGE_THIS_TO_RANDOM_32_CHAR_STRING
 
-# Security - CRITICAL: Generate a secure random JWT secret
-# You can generate one with: openssl rand -base64 32
-JWT_SECRET=your-secure-random-jwt-secret-here
+# Required: URLs (update with your domain)
+FRONTEND_URL=https://your-domain.com
+BACKEND_URL=https://your-domain.com
+ADMIN_URL=https://your-domain.com
 
-# Database Configuration (PostgreSQL)
-DB_USER=picpeak
-DB_PASSWORD=your-secure-database-password
-DB_NAME=picpeak
-
-# Email Configuration
+# Required: Email Settings
 SMTP_HOST=smtp.gmail.com
 SMTP_PORT=587
-SMTP_SECURE=true
 SMTP_USER=your-email@gmail.com
 SMTP_PASS=your-app-password
-EMAIL_FROM=noreply@yourdomain.com
+SMTP_FROM=your-email@gmail.com
 
-# Umami Analytics (Optional)
-UMAMI_URL=https://analytics.yourdomain.com
-UMAMI_WEBSITE_ID=your-website-id
-UMAMI_HASH_SALT=your-random-hash-salt
+# Required: Initial Admin Account
+ADMIN_EMAIL=admin@your-domain.com
+ADMIN_PASSWORD=change-this-password
 
-# First Admin User (for initial setup)
-# Run: docker-compose exec backend node scripts/create-admin.js --email admin@yourdomain.com
-ADMIN_EMAIL=admin@yourdomain.com
+# Database (PostgreSQL recommended for production)
+DATABASE_CLIENT=pg
+DB_HOST=postgres
+DB_PORT=5432
+DB_NAME=picpeak
+DB_USER=picpeak
+DB_PASSWORD=secure-database-password
+
+# Optional: Customization
+SITE_NAME=PicPeak
+DEFAULT_EXPIRATION_DAYS=30
+SESSION_TIMEOUT_MINUTES=60
+
+# Optional: Analytics (Umami)
+VITE_UMAMI_URL=
+VITE_UMAMI_WEBSITE_ID=
+
+# Advanced: Performance Tuning
+NODE_ENV=production
+BCRYPT_ROUNDS=12
+RATE_LIMIT_WINDOW_MS=900000
+RATE_LIMIT_MAX_REQUESTS=100