Update validation method for DLC products to improve data handling

Change the mutation HTTP method from PUT to POST for the DLC product validation endpoint to correctly handle state changes.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 1e4433b5-47ab-464c-b663-fea2e53367dd
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/1e4433b5-47ab-464c-b663-fea2e53367dd/y2Jqp8Y

client/src/pages/DlcPage.tsx

@@ -159,7 +159,7 @@ export default function DlcPage() {
 
   // Validate mutation - optimized cache invalidation
   const validateMutation = useMutation({
-    mutationFn: (id: number) => apiRequest(`/api/dlc-products/${id}/validate`, "PUT"),
+    mutationFn: (id: number) => apiRequest(`/api/dlc-products/${id}/validate`, "POST"),
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ["/api/dlc-products"], exact: false });
       queryClient.invalidateQueries({ queryKey: ["/api/dlc-products/stats"], exact: false });