add signal for app vs web

apps/frontend/src/components/ui/AdPlaceholder.vue

@@ -57,6 +57,9 @@ onMounted(() => {
       {
         divId: "modrinth-rail-1",
         baseDivId: "pb-slot-square-2",
+        targeting: {
+          location: "web",
+        },
       },
     ]);
   });

apps/frontend/src/public/promo-frame.html

@@ -66,6 +66,9 @@
             {
               divId: "modrinth-rail-1",
               baseDivId: "pb-slot-square-2",
+              targeting: {
+                location: "app",
+              },
             },
           ]);