fix(excel): 解决Excel导入时字段映射和数据处理问题

- 为CreditCourtAnnouncementImportParam添加ExcelHeaderAlias注解支持多别名映射
- 为CreditJudgmentDebtorImportParam添加ExcelHeaderAlias注解支持多别名映射
- 修复CreditXgxfController中appellee字段取值逻辑，使用正确的数据源
- 统一字段映射规则，确保Excel表头别名能够正确识别

src/main/java/com/gxwebsoft/credit/controller/CreditXgxfController.java

@@ -484,11 +484,12 @@ public class CreditXgxfController extends BaseController {
             : param.getPlaintiffAppellant2();
         String appellee = !ImportHelper.isBlank(param.getAppellee())
             ? param.getAppellee()
-            : param.getAppellee2();
+            : param.getDataType();
         String courtName = !ImportHelper.isBlank(param.getCourtName())
             ? param.getCourtName()
             : param.getCourtName2();
 
+
         entity.setCaseNumber(param.getCaseNumber());
         entity.setType(param.getType());
         entity.setDataType(param.getDataType());

src/main/java/com/gxwebsoft/credit/param/CreditCourtAnnouncementImportParam.java

@@ -1,6 +1,7 @@
 package com.gxwebsoft.credit.param;
 
 import cn.afterturn.easypoi.excel.annotation.Excel;
+import com.gxwebsoft.credit.excel.ExcelHeaderAlias;
 import lombok.Data;
 
 import java.io.Serializable;
@@ -46,6 +47,7 @@ public class CreditCourtAnnouncementImportParam implements Serializable {
     private String involvedAmount2;
 
     @Excel(name = "法院")
+    @ExcelHeaderAlias({"公告人","执行法院"})
     private String courtName;
 
     @Excel(name = "数据状态")

src/main/java/com/gxwebsoft/credit/param/CreditJudgmentDebtorImportParam.java

@@ -1,6 +1,7 @@
 package com.gxwebsoft.credit.param;
 
 import cn.afterturn.easypoi.excel.annotation.Excel;
+import com.gxwebsoft.credit.excel.ExcelHeaderAlias;
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Data;
 
@@ -26,6 +27,7 @@ public class CreditJudgmentDebtorImportParam implements Serializable {
     private String plaintiffAppellant;
 
     @Excel(name = "被告/被上诉人")
+    @ExcelHeaderAlias({"被执行人名称"})
     private String appellee;
 
     @Excel(name = "其他当事人/第三人")