[Developer] #424 add LLM explanation for VPD policies

src/main/java/com/cloudhandson/vpdbackoffice/domain/vpd/VpdPolicyExplanation.java

@@ -0,0 +1,10 @@
+package com.cloudhandson.vpdbackoffice.domain.vpd;
+
+public record VpdPolicyExplanation(
+    String status,
+    String answer,
+    String prompt,
+    VpdPolicyDetail detail,
+    VpdFunctionSource functionSource
+) {
+}