overpass: drop dead kumi.systems mirror (500 + no CORS) from endpoint ladder

vendor/clouds3d.js

@@ -1834,8 +1834,8 @@ var CAR_QUERIES = [
 );
 var CAR_ENDPOINTS = [
     'https://maps.mail.ru/osm/tools/overpass/api/interpreter',
-    'https://overpass-api.de/api/interpreter',
-    'https://overpass.kumi.systems/api/interpreter'
+    'https://overpass-api.de/api/interpreter'
+    // kumi.systems removed: dead upstream (HTTP 500, no CORS headers)
 ];
 // spread first-attempt load across the mirrors per cell index
 CAR_QUERIES.forEach(function (e, i) { e.start = i % CAR_ENDPOINTS.length; });