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

roles/sigvild-gallery/templates/frontend.caddy.j2

@@ -0,0 +1,42 @@
+{{ sigvild_gallery_frontend_domain }} {
+    root * {{ sigvild_gallery_web_root }}
+    file_server
+
+    # SPA routing - serve index.html for all routes
+    try_files {path} /index.html
+
+    # Security headers
+    header {
+        X-Frame-Options DENY
+        X-Content-Type-Options nosniff
+        X-XSS-Protection "1; mode=block"
+        Referrer-Policy strict-origin-when-cross-origin
+        Permissions-Policy "geolocation=(), microphone=(), camera=()"
+    }
+
+    # Cache static assets aggressively
+    @static {
+        path /_app/* /assets/* /icons/* *.ico *.png *.jpg *.jpeg *.svg *.webp *.woff *.woff2
+    }
+    header @static {
+        Cache-Control "public, max-age=31536000, immutable"
+        Vary "Accept-Encoding"
+    }
+
+    # Cache HTML with shorter duration
+    @html {
+        path *.html /
+    }
+    header @html {
+        Cache-Control "public, max-age=3600, must-revalidate"
+    }
+
+    # Enable compression
+    encode gzip
+
+    # Logging for debugging (can be removed in production)
+    log {
+        output file /var/log/caddy/sigvild-frontend.log
+        level INFO
+    }
+}