Add WMTS license fallback to capabilities document

When a WMTS layer doesn't have a specific license URL, the license
link now falls back to the service's GetCapabilities URL with the
service title. This ensures all WMTS layers have proper attribution
linking back to the source capabilities document.

- Pass serviceInfo to addWMTSLayerToViewer function
- Construct proper GetCapabilities URL (SERVICE=WMTS&REQUEST=GetCapabilities)
- Use service title as license link title when no layer license exists

Author: prushforth

src/script/main.js

@@ -3080,14 +3080,14 @@ function createViewerForWMTSLayer(index, layer, serviceInfo, selectedFormat, que
     viewer.appendChild(baseLayer);
   }
 
-  addWMTSLayerToViewer(viewer, layer, tileMatrixSet, selectedFormat, queryEnabled, styleName, imgFormat, includeBounds, index);
+  addWMTSLayerToViewer(viewer, layer, tileMatrixSet, selectedFormat, queryEnabled, styleName, imgFormat, includeBounds, index, serviceInfo);
 
   container.appendChild(viewer);
 
   console.log('Created WMTS viewer for layer:', layer.name);
 }
 
-function addWMTSLayerToViewer(viewer, layer, tileMatrixSet, selectedFormat, queryEnabled, selectedStyle, imageFormat, boundsEnabled, layerIndex) {
+function addWMTSLayerToViewer(viewer, layer, tileMatrixSet, selectedFormat, queryEnabled, selectedStyle, imageFormat, boundsEnabled, layerIndex, serviceInfo) {
   const viewerProjection = viewer.getAttribute('projection') || 'OSMTILE';
   const bbox = layer.bbox;
 
@@ -3109,13 +3109,26 @@ function addWMTSLayerToViewer(viewer, layer, tileMatrixSet, selectedFormat, quer
     mapLayer.appendChild(mapMeta);
   }
 
+  // Add license link - use layer license if available, otherwise fall back to capabilities document
+  const licenseLink = document.createElement('map-link');
+  licenseLink.setAttribute('rel', 'license');
+  
   if (layer.licenseUrl) {
-    const licenseLink = document.createElement('map-link');
-    licenseLink.setAttribute('rel', 'license');
     licenseLink.setAttribute('href', layer.licenseUrl);
     if (layer.licenseTitle) {
       licenseLink.setAttribute('title', layer.licenseTitle + ' for ' + layer.title);
     }
+  } else if (serviceInfo && serviceInfo.baseUrl) {
+    // Fallback to capabilities document - construct proper GetCapabilities URL
+    const capabilitiesUrl = serviceInfo.baseUrl + '?SERVICE=WMTS&REQUEST=GetCapabilities';
+    licenseLink.setAttribute('href', capabilitiesUrl);
+    if (serviceInfo.title) {
+      licenseLink.setAttribute('title', serviceInfo.title);
+    }
+  }
+  
+  // Only append if we have an href
+  if (licenseLink.getAttribute('href')) {
     mapLayer.appendChild(licenseLink);
   }