Fix JSON parsing error for missingRequiredFields

Changes the type of missingRequiredFields from List<String> to
List<ValidationErrorFields> to match the actual JSON structure
returned by the TeamServer API.

Fixes error: Expected a string but was BEGIN_OBJECT at line 1219
column 34 path $.applications[19].missingRequiredFields[0]

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: ChrisEdwards

src/main/java/com/contrast/labs/ai/mcp/contrast/sdkexstension/data/application/Application.java

@@ -68,7 +68,7 @@ public class Application {
     private List<ValidationErrorFields> validationErrorFields;
 
     @SerializedName("missingRequiredFields")
-    private List<String> missingRequiredFields;
+    private List<ValidationErrorFields> missingRequiredFields;
 
     @SerializedName("protect")
     private Object protect;
@@ -268,11 +268,11 @@ public void setValidationErrorFields(List<ValidationErrorFields> validationError
         this.validationErrorFields = validationErrorFields;
     }
 
-    public List<String> getMissingRequiredFields() {
+    public List<ValidationErrorFields> getMissingRequiredFields() {
         return missingRequiredFields;
     }
 
-    public void setMissingRequiredFields(List<String> missingRequiredFields) {
+    public void setMissingRequiredFields(List<ValidationErrorFields> missingRequiredFields) {
         this.missingRequiredFields = missingRequiredFields;
     }