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

roles/sigvild-gallery/defaults/main.yml

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+---
+# Sigvild Gallery Ansible Role - Default Variables
+
+# Service Configuration
+sigvild_gallery_user: sigvild
+
+# Paths
+sigvild_gallery_home: /opt/sigvild-gallery
+sigvild_gallery_web_root: /var/www/sigvild-gallery
+sigvild_gallery_binary: "{{ sigvild_gallery_home }}/sigvild-gallery"
+sigvild_gallery_data_dir: "{{ sigvild_gallery_home }}/pb_data"
+
+# Domains
+sigvild_gallery_frontend_domain: sigvild.no
+sigvild_gallery_api_domain: api.sigvild.no
+
+# Backend Service
+sigvild_gallery_port: 8090
+sigvild_gallery_host: "127.0.0.1"
+
+# Environment Variables (for SystemD service)
+sigvild_gallery_host_username: host
+sigvild_gallery_host_password: "{{ vault_sigvild_host_password }}"
+sigvild_gallery_guest_username: guest
+sigvild_gallery_guest_password: "{{ vault_sigvild_guest_password }}"
+
+# Build configuration
+sigvild_gallery_local_project_path: "{{ ansible_env.PWD }}/sigvild-gallery"
+
+# Service configuration
+sigvild_gallery_service_enabled: true
+sigvild_gallery_service_state: started
+
+# Caddy integration (assumes caddy role provides these)
+# caddy_sites_enabled_dir: /etc/caddy/sites-enabled
+# caddy_user: caddy