Add HTTPS configuration management system

- Add HTTPSConfig model for managing HTTPS settings
- Add admin routes for HTTPS configuration management
- Add beautiful admin template for HTTPS configuration
- Add database migration for https_config table
- Add CLI utility for HTTPS management
- Add setup script for automated configuration
- Add Caddy configuration generator and manager
- Add comprehensive documentation (3 guides)
- Add HTTPS Configuration card to admin dashboard
- Implement input validation and security features
- Add admin-only access control with audit trail
- Add real-time configuration preview
- Integrate with existing Caddy reverse proxy

Features:
- Enable/disable HTTPS from web interface
- Configure domain, hostname, IP address, port
- Automatic SSL certificate management via Let's Encrypt
- Real-time Caddyfile generation and reload
- Full audit trail with admin username and timestamps
- Support for HTTPS and HTTP fallback access points
- Beautiful, mobile-responsive UI

Modified files:
- app/models/__init__.py (added HTTPSConfig import)
- app/blueprints/admin.py (added HTTPS routes)
- app/templates/admin/admin.html (added HTTPS card)
- docker-compose.yml (added Caddyfile mount and admin port)

New files:
- app/models/https_config.py
- app/blueprints/https_config.html
- app/utils/caddy_manager.py
- https_manager.py
- setup_https.sh
- migrations/add_https_config_table.py
- migrations/add_email_to_https_config.py
- HTTPS_STATUS.txt
- Documentation files (3 markdown guides)

docker-compose.yml

@@ -10,6 +10,7 @@ services:
     volumes:
       - ./instance:/app/instance
       - ./app/static/uploads:/app/app/static/uploads
+      - ./Caddyfile:/app/Caddyfile
     environment:
       - FLASK_ENV=production
       - SECRET_KEY=${SECRET_KEY:-your-secret-key-change-this}
@@ -33,6 +34,7 @@ services:
       - "80:80"
       - "443:443"
       - "443:443/udp"  # HTTP/3 support
+      - "2019:2019"     # Caddy admin API
     volumes:
       - ./Caddyfile:/etc/caddy/Caddyfile:ro
       - caddy-data:/data