fix: configure PostgreSQL for production and clean up deployment

- Fix database configuration to use PostgreSQL in production
- Add knexfile.js to support both SQLite (dev) and PostgreSQL (prod)
- Create admin user creation script (scripts/create-admin.js)
- Clean up docker-compose files:
  - Remove redundant docker-compose.yml and docker-compose.local.yml
  - Create docker-compose.dev.yml for development
  - Update docker-compose.prod.yml with proper DB configuration
- Clean up environment files:
  - Update .env.example for development
  - Update .env.production.example with proper settings
  - Remove redundant .env.local
- Update backend .env.example with database configuration options
- Create comprehensive DEPLOYMENT.md with admin setup instructions
- Fix production database name consistency (picpeak instead of photoapp)

docker-compose.yml

@@ -1,49 +0,0 @@
-# docker-compose.yml - Development configuration
-
-services:
-  backend:
-    build: 
-      context: ./backend
-      dockerfile: Dockerfile
-    ports:
-      - "3001:3000"
-    environment:
-      - NODE_ENV=development
-      - PORT=3000
-      - JWT_SECRET=b55e4b3e9f212e1d1836c2ee2ec5ac47672350acdf1391c894d3433646579ad0
-      - ADMIN_URL=http://localhost:3001
-      - FRONTEND_URL=http://localhost:3005
-      - SMTP_HOST=mailhog
-      - SMTP_PORT=1025
-      - SMTP_SECURE=false
-      - SMTP_USER=
-      - SMTP_PASS=
-      - EMAIL_FROM=noreply@localhost
-    volumes:
-      - ./backend:/app
-      - /app/node_modules
-      - ./storage:/app/storage
-      - ./data:/app/data
-      - ./logs:/app/logs
-    depends_on:
-      - mailhog
-    command: node server.js
-
-  frontend:
-    build:
-      context: ./frontend
-      dockerfile: Dockerfile
-    ports:
-      - "3005:80"
-    environment:
-      - REACT_APP_API_URL=http://localhost:3001
-    volumes:
-      - ./frontend/nginx.conf:/etc/nginx/conf.d/default.conf:ro
-    depends_on:
-      - backend
-
-  mailhog:
-    image: mailhog/mailhog:latest
-    ports:
-      - "1025:1025"
-      - "8025:8025"