Add Sigvild Gallery wedding photo application with automated deployment and improve Caddy plugin management

roles/sigvild-gallery/templates/sigvild-gallery.service.j2

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+[Unit]
+Description=Sigvild Wedding Gallery API
+After=network.target
+
+[Service]
+Type=simple
+User={{ sigvild_gallery_user }}
+Group={{ sigvild_gallery_user }}
+WorkingDirectory={{ sigvild_gallery_home }}
+ExecStart={{ sigvild_gallery_binary }} serve --http={{ sigvild_gallery_host }}:{{ sigvild_gallery_port }}
+
+# Environment variables 
+Environment="SIGVILD_ENVIRONMENT"="production" # Lets caddy handle CORS
+Environment="HOST_USERNAME={{ sigvild_gallery_host_username }}"
+Environment="HOST_PASSWORD={{ sigvild_gallery_host_password }}"
+Environment="HOST_DISPLAY_NAME=Wedding Host"
+Environment="GUEST_USERNAME={{ sigvild_gallery_guest_username }}"
+Environment="GUEST_PASSWORD={{ sigvild_gallery_guest_password }}"
+Environment="GUEST_DISPLAY_NAME=Wedding Guest"
+
+# Restart configuration
+Restart=always
+RestartSec=3
+
+# Security sandboxing
+NoNewPrivileges=yes
+PrivateTmp=yes
+ProtectSystem=strict
+ProtectHome=yes
+ReadWritePaths={{ sigvild_gallery_data_dir }}
+
+# Allow binding to port (if needed)
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+
+[Install]
+WantedBy=multi-user.target