feat(credit): 添加原告/上诉人字段支持

- 在CreditUser实体中新增plaintiffAppellant字段用于存储原告/上诉人信息
- 更新CreditUserController中的数据映射逻辑以包含新字段
- 在CreditUserImportParam中添加Excel导入支持和字段映射
- 在CreditUserParam中定义查询参数结构包含新字段
- 新增CreditBankruptcyImportSheetSelectionTest测试类验证多工作表选择逻辑
- 实现破产重整数据导入时优先选择正确工作表的功能

src/test/java/com/gxwebsoft/credit/controller/CreditBankruptcyImportSheetSelectionTest.java

@@ -0,0 +1,105 @@
+package com.gxwebsoft.credit.controller;
+
+import com.gxwebsoft.common.core.web.ApiResult;
+import com.gxwebsoft.credit.entity.CreditBankruptcy;
+import com.gxwebsoft.credit.service.CreditBankruptcyService;
+import com.gxwebsoft.credit.service.CreditCompanyRecordCountService;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.springframework.mock.web.MockMultipartFile;
+import org.springframework.test.util.ReflectionTestUtils;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.ByteArrayOutputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class CreditBankruptcyImportSheetSelectionTest {
+
+    @Test
+    void import_should_prefer_sheet_named_bankruptcy_reorganization() throws Exception {
+        MultipartFile file = buildWorkbookWithTwoSheets();
+
+        CreditBankruptcyController controller = new CreditBankruptcyController();
+
+        CreditBankruptcyService creditBankruptcyService = Mockito.mock(CreditBankruptcyService.class);
+        BatchImportSupport batchImportSupport = Mockito.mock(BatchImportSupport.class);
+        CreditCompanyRecordCountService recordCountService = Mockito.mock(CreditCompanyRecordCountService.class);
+
+        // Capture inserted entities; controller clears the chunk list after calling persistInsertOnlyChunk.
+        List<CreditBankruptcy> inserted = new ArrayList<>();
+        Mockito.when(batchImportSupport.persistInsertOnlyChunk(
+                Mockito.eq(creditBankruptcyService),
+                Mockito.anyList(),
+                Mockito.anyList(),
+                Mockito.anyInt(),
+                Mockito.any(),
+                Mockito.anyString(),
+                Mockito.anyList()
+            ))
+            .thenAnswer(invocation -> {
+                @SuppressWarnings("unchecked")
+                List<CreditBankruptcy> items = new ArrayList<>((List<CreditBankruptcy>) invocation.getArgument(1));
+                inserted.addAll(items);
+                return items.size();
+            });
+
+        ReflectionTestUtils.setField(controller, "creditBankruptcyService", creditBankruptcyService);
+        ReflectionTestUtils.setField(controller, "batchImportSupport", batchImportSupport);
+        ReflectionTestUtils.setField(controller, "creditCompanyRecordCountService", recordCountService);
+
+        ApiResult<List<String>> result = controller.importBatch(file, null);
+
+        assertNotNull(result);
+        assertEquals(0, result.getCode());
+        assertTrue(result.getMessage().contains("成功导入1条"), "message=" + result.getMessage());
+        assertEquals(1, inserted.size());
+        // "历史破产重整" sheet is first; we should import from "破产重整" instead.
+        assertEquals("R1", inserted.get(0).getCode());
+    }
+
+    private static MultipartFile buildWorkbookWithTwoSheets() throws Exception {
+        try (Workbook workbook = new XSSFWorkbook()) {
+            // Put "历史破产重整" first to ensure old readAnySheet() behavior would import the wrong sheet.
+            writeBankruptcySheet(workbook.createSheet("历史破产重整"), "H1");
+            writeBankruptcySheet(workbook.createSheet("破产重整"), "R1");
+
+            try (ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
+                workbook.write(bos);
+                return new MockMultipartFile(
+                    "file",
+                    "bankruptcy.xlsx",
+                    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+                    bos.toByteArray()
+                );
+            }
+        }
+    }
+
+    private static void writeBankruptcySheet(Sheet sheet, String code) {
+        // Keep it simple: a single header row + single data row.
+        Row header = sheet.createRow(0);
+        header.createCell(0).setCellValue("案号");
+        header.createCell(1).setCellValue("案件类型");
+        header.createCell(2).setCellValue("当事人");
+        header.createCell(3).setCellValue("经办法院");
+        header.createCell(4).setCellValue("公开日期");
+        header.createCell(5).setCellValue("备注");
+
+        Row row = sheet.createRow(1);
+        row.createCell(0).setCellValue(code);
+        row.createCell(1).setCellValue("破产重整");
+        row.createCell(2).setCellValue("示例公司");
+        row.createCell(3).setCellValue("示例法院");
+        row.createCell(4).setCellValue("2026-01-01");
+        row.createCell(5).setCellValue("备注");
+    }
+}