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)

migrations/add_email_to_https_config.py

@@ -0,0 +1,33 @@
+"""Add email field to https_config table."""
+import sys
+sys.path.insert(0, '/app')
+
+from app.app import create_app
+from app.extensions import db
+from sqlalchemy import text
+
+app = create_app()
+
+with app.app_context():
+    print("Adding email column to https_config table...")
+    
+    try:
+        # Check if column already exists
+        inspector = db.inspect(db.engine)
+        columns = [col['name'] for col in inspector.get_columns('https_config')]
+        
+        if 'email' not in columns:
+            # Add the column
+            with db.engine.connect() as conn:
+                conn.execute(text('ALTER TABLE https_config ADD COLUMN email VARCHAR(255)'))
+                conn.commit()
+            print("✓ Email column added to https_config table!")
+        else:
+            print("✓ Email column already exists in https_config table.")
+            
+    except Exception as e:
+        print(f"ℹ️  Note: If table doesn't exist, run add_https_config_table.py first")
+        print(f"Error details: {str(e)}")
+        print("\nAlternatively, you can reset the database:")
+        print("  rm instance/digiserver.db")
+        print("  python migrations/add_https_config_table.py")