Preserve Cloudinary configuration on settings update

Modify Cloudinary configuration endpoint to allow partial updates and preserve existing API keys and secrets when not explicitly provided, and clear input fields on successful save.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/sEXz3DF

client/src/pages/settings.tsx

@@ -55,18 +55,28 @@ export default function Settings() {
   const hasExistingConfig = !!openrouterConfig;
 
   const saveCloudinaryMutation = useMutation({
-    mutationFn: () => 
-      apiRequest('POST', '/api/cloudinary/config', {
+    mutationFn: () => {
+      const payload: any = {
         cloudName,
-        apiKey,
-        apiSecret,
-      }),
+      };
+      
+      // N'inclure apiKey et apiSecret que s'ils ne sont pas vides
+      if (apiKey && apiKey.trim() !== "") {
+        payload.apiKey = apiKey;
+      }
+      if (apiSecret && apiSecret.trim() !== "") {
+        payload.apiSecret = apiSecret;
+      }
+      
+      return apiRequest('POST', '/api/cloudinary/config', payload);
+    },
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ['/api/cloudinary/config'] });
       toast({
         title: "Configuration sauvegardée",
         description: "Vos paramètres Cloudinary ont été enregistrés",
       });
+      setApiKey(""); // Clear the API key after saving
       setApiSecret(""); // Clear the secret after saving
     },
     onError: () => {