feat: add app ping url (#2380)

Co-authored-by: Meier Lukas <meierschlumpf@gmail.com>

packages/old-import/src/mappers/map-app.ts

@@ -11,6 +11,7 @@ export const mapOldmarrApp = (app: OldmarrApp): InferSelectModel<typeof apps> =>
     iconUrl: app.appearance.iconUrl,
     description: app.behaviour.tooltipDescription ?? null,
     href: app.behaviour.externalUrl || app.url,
+    pingUrl: app.url.length > 0 ? app.url : null,
   };
 };
 
@@ -23,5 +24,6 @@ export const mapOldmarrBookmarkApp = (
     iconUrl: app.iconUrl,
     description: null,
     href: app.href,
+    pingUrl: null,
   };
 };