fix: reduce campaigns fetch limit to 100 (backend max)

Backend validates limit with le=100, sending 200 caused 422 error.

src/pages/AdminPartnerCampaignAssign.tsx

@@ -21,7 +21,7 @@ export default function AdminPartnerCampaignAssign() {
   // Fetch all campaigns
   const { data: campaignsData, isLoading } = useQuery({
     queryKey: ['admin-campaigns-all'],
-    queryFn: () => campaignsApi.getCampaigns(true, 0, 200),
+    queryFn: () => campaignsApi.getCampaigns(true, 0, 100),
   });
 
   const assignMutation = useMutation({