Add public GeoJSON features API and load public 3D objects on maps.

Expose GET /v1/features/public (optional kind filter) and update Leaflet/MapLibre demos to render all public 3D assets globally, while still merging owner collections after login.

Made-with: Cursor

internal/app/service.go

@@ -395,6 +395,43 @@ func (s *Service) ListFeatures(ownerKey, collectionID string) ([]store.Feature,
 	return features, nil
 }
 
+func (s *Service) ListPublicFeatures(kind string) []store.Feature {
+	filterKind := strings.TrimSpace(strings.ToLower(kind))
+	features := s.store.ListFeaturesAll()
+	result := make([]store.Feature, 0, len(features))
+	for idx := range features {
+		featureAssets := s.store.ListAssetsByFeature(features[idx].ID)
+		assets := make([]map[string]interface{}, 0, len(featureAssets))
+		for _, linkedAsset := range featureAssets {
+			if !linkedAsset.IsPublic {
+				continue
+			}
+			if filterKind != "" && linkedAsset.Kind != filterKind {
+				continue
+			}
+			assets = append(assets, map[string]interface{}{
+				"id":          linkedAsset.ID,
+				"kind":        linkedAsset.Kind,
+				"name":        linkedAsset.Name,
+				"description": linkedAsset.Description,
+				"checksum":    linkedAsset.Checksum,
+				"ext":         linkedAsset.Ext,
+				"isPublic":    linkedAsset.IsPublic,
+				"link":        "/v1/assets/" + linkedAsset.ID + "/download",
+			})
+		}
+		if len(assets) == 0 {
+			continue
+		}
+		if features[idx].Properties == nil {
+			features[idx].Properties = map[string]interface{}{}
+		}
+		features[idx].Properties["assets"] = assets
+		result = append(result, features[idx])
+	}
+	return result
+}
+
 func (s *Service) DeleteFeature(ownerKey, featureID string) error {
 	feature, err := s.store.GetFeature(featureID)
 	if err != nil {