fix: correct subjectFilterRequest format for Ivanti FP workflow API

The API expects { subject: 'hostFinding', filterRequest: { filters } }
not a flat filter object. Confirmed working via direct curl test —
workflow ID 33418832 created successfully.

backend/routes/ivantiFpWorkflow.js

@@ -75,19 +75,19 @@ function validateFpWorkflowForm(body) {
 
 /**
  * Builds the subjectFilterRequest JSON for the Ivanti FP workflow endpoint.
- * This is a stringified filter that tells Ivanti which host findings to include.
- * Format matches the search endpoint filter schema: { filters, projection, sort }
+ * Format: { subject, filterRequest: { filters } }
  */
 function buildSubjectFilterRequest(findingIds) {
     return JSON.stringify({
+        subject: 'hostFinding',
+        filterRequest: {
             filters: [{
                 field: 'id',
                 exclusive: false,
                 operator: 'IN',
                 value: findingIds.map(id => String(id)).join(',')
-        }],
-        projection: 'internal',
-        sort: [{ field: 'id', direction: 'ASC' }]
+            }]
+        }
     });
 }