Add UA auto detection for Stash iOS

backend/sub-store.js

@@ -871,7 +871,10 @@ function service() {
             return "Surge";
         } else if (UA.indexOf("Decar") !== -1 || UA.indexOf("Loon") !== -1) {
             return "Loon";
-        } else {
+        } else if (UA.indexOf("Stash") !== -1) {
+            return "Clash";
+        }
+        else {
             return null;
         }
     }