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.

docker-compose.yml

@@ -0,0 +1,92 @@
+version: '3.8'
+
+services:
+  # PostgreSQL Database
+  postgres:
+    image: postgres:15-alpine
+    container_name: picpeak-postgres
+    environment:
+      POSTGRES_DB: ${DB_NAME:-picpeak}
+      POSTGRES_USER: ${DB_USER:-picpeak}
+      POSTGRES_PASSWORD: ${DB_PASSWORD:-picpeak}
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${DB_USER:-picpeak}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # Backend API
+  backend:
+    build: ./backend
+    container_name: picpeak-backend
+    depends_on:
+      postgres:
+        condition: service_healthy
+    environment:
+      NODE_ENV: production
+      DATABASE_CLIENT: pg
+      DB_HOST: postgres
+      DB_PORT: 5432
+      DB_NAME: ${DB_NAME:-picpeak}
+      DB_USER: ${DB_USER:-picpeak}
+      DB_PASSWORD: ${DB_PASSWORD:-picpeak}
+    env_file:
+      - .env
+    volumes:
+      - ./storage:/app/storage
+      - ./data:/app/data
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:3000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  # Frontend
+  frontend:
+    build: 
+      context: ./frontend
+      args:
+        VITE_API_URL: ${VITE_API_URL:-/api}
+        VITE_UMAMI_URL: ${VITE_UMAMI_URL}
+        VITE_UMAMI_WEBSITE_ID: ${VITE_UMAMI_WEBSITE_ID}
+    container_name: picpeak-frontend
+    depends_on:
+      - backend
+    restart: unless-stopped
+
+  # Nginx Reverse Proxy
+  nginx:
+    image: nginx:alpine
+    container_name: picpeak-nginx
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
+      - ./certbot/conf:/etc/letsencrypt
+      - ./certbot/www:/var/www/certbot
+    depends_on:
+      - frontend
+      - backend
+    restart: unless-stopped
+    command: "/bin/sh -c 'while :; do sleep 6h & wait $${!}; nginx -s reload; done & nginx -g \"daemon off;\"'"
+
+  # Certbot for SSL
+  certbot:
+    image: certbot/certbot
+    container_name: picpeak-certbot
+    volumes:
+      - ./certbot/conf:/etc/letsencrypt
+      - ./certbot/www:/var/www/certbot
+    entrypoint: "/bin/sh -c 'trap exit TERM; while :; do certbot renew; sleep 12h & wait $${!}; done;'"
+
+volumes:
+  postgres_data:
+
+networks:
+  default:
+    name: picpeak-network