refactor: apply MSA naming standard for DTOs and Scaffold template (Req->Request, Res->Response)

dap-tool-payment/src/main/java/io/shinhanlife/dap/mcc/dto/PaymentApprovalRequest.java

@@ -5,7 +5,7 @@ import lombok.Data;
 
 /**
  * @package io.shinhanlife.dap.mcc.dto
- * @className PaymentApprovalReq
+ * @className PaymentApprovalRequest
  * @description AX HUB 시스템 처리 클래스
  * @author 0986406
  * @create 2026.09.01
@@ -19,7 +19,7 @@ import lombok.Data;
  */
 @Data
 @JsonInclude(JsonInclude.Include.NON_NULL)
-public class PaymentApprovalReq {
+public class PaymentApprovalRequest {
     private String accountNumber;
     private long amount;
     private String paymentMethod;

dap-tool-payment/src/main/java/io/shinhanlife/dap/mcc/dto/PaymentApprovalResponse.java

@@ -5,7 +5,7 @@ import lombok.Data;
 
 /**
  * @package io.shinhanlife.dap.mcc.dto
- * @className PaymentApprovalRes
+ * @className PaymentApprovalResponse
  * @description AX HUB 시스템 처리 클래스
  * @author 0986406
  * @create 2026.09.01
@@ -19,7 +19,7 @@ import lombok.Data;
  */
 @Data
 @JsonInclude(JsonInclude.Include.NON_NULL)
-public class PaymentApprovalRes {
+public class PaymentApprovalResponse {
     private String status;
     private String message;
     private String transactionId;

dap-tool-payment/src/main/java/io/shinhanlife/dap/mcc/service/PaymentApprovalService.java

@@ -3,5 +3,5 @@ package io.shinhanlife.dap.mcc.service;
 import io.shinhanlife.dap.mcc.dto.*;
 
 public interface PaymentApprovalService {
-    Object execute(PaymentApprovalReq req);
+    Object execute(PaymentApprovalRequest req);
 }

dap-tool-payment/src/main/java/io/shinhanlife/dap/mcc/service/impl/PaymentApprovalServiceImpl.java

@@ -4,7 +4,7 @@ import io.shinhanlife.dap.mcc.annotation.McpFunction;
 import io.shinhanlife.dap.mcc.annotation.McpTool;
 import io.shinhanlife.dap.mcc.service.PaymentApprovalService;
 import io.shinhanlife.dap.mcc.service.AbstractMcpToolService;
-import io.shinhanlife.dap.mcc.dto.PaymentApprovalReq;
+import io.shinhanlife.dap.mcc.dto.PaymentApprovalRequest;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 
@@ -39,7 +39,7 @@ public class PaymentApprovalServiceImpl extends AbstractMcpToolService implement
         mappingId = "PAY_001"
     )
     @Override
-    public Object execute(PaymentApprovalReq req) {
+    public Object execute(PaymentApprovalRequest req) {
         log.info("[Payment] 결제 승인 요청 수신. 계좌: {}, 금액: {}", req.getAccountNumber(), req.getAmount());
         
         // 레거시 연동