fix: resolve TypeScript type mismatch error in fetchRestaurantBySlug

apps/web/src/app/menu/[slug]/page.tsx

@@ -81,7 +81,9 @@ async function fetchRestaurantBySlug(slug: string) {
       .select("id, name, slug, logo_url, phone, address")
       .eq("slug", slug)
       .maybeSingle();
-    bySlug = fallback;
+    if (fallback) {
+      return { ...fallback, cover_url: null };
+    }
   }
 
   if (bySlug) return bySlug;
@@ -98,7 +100,9 @@ async function fetchRestaurantBySlug(slug: string) {
       .select("restaurant_id, restaurants(id, name, slug, logo_url, phone, address)")
       .eq("hostname", slug)
       .maybeSingle();
-    domainRow = fallbackDom;
+    if (fallbackDom?.restaurants) {
+      return { ...(fallbackDom.restaurants as any), cover_url: null };
+    }
   }
 
   return (domainRow?.restaurants as any) ?? null;