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/http/handlers.go

@@ -41,6 +41,7 @@ func (a *API) Routes() http.Handler {
 	mux.HandleFunc("DELETE /v1/collections/{id}", a.deleteCollection)
 	mux.HandleFunc("POST /v1/collections/{id}/features", a.createFeature)
 	mux.HandleFunc("GET /v1/collections/{id}/features", a.listFeatures)
+	mux.HandleFunc("GET /v1/features/public", a.listPublicFeatures)
 	mux.HandleFunc("DELETE /v1/features/{id}", a.deleteFeature)
 	mux.HandleFunc("POST /v1/assets", a.createAsset)
 	mux.HandleFunc("PATCH /v1/assets/{id}", a.patchAsset)
@@ -369,6 +370,15 @@ func (a *API) listFeatures(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]interface{}{"features": features})
 }
 
+func (a *API) listPublicFeatures(w http.ResponseWriter, r *http.Request) {
+	kind := r.URL.Query().Get("kind")
+	if kind != "" && kind != "3d" && kind != "image" {
+		writeErr(w, app.ErrBadRequest)
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]interface{}{"features": a.service.ListPublicFeatures(kind)})
+}
+
 func (a *API) deleteFeature(w http.ResponseWriter, r *http.Request) {
 	user, err := a.authUser(r)
 	if err != nil {