feat(credit): 优化破产重整数据导入功能

- 优先从名为"破产重整"的标签页导入数据，避免多工作表文件中的意外导入
- 当指定标签页不存在时，向后兼容使用任意工作表导入方式
- 添加详细的注释说明导入逻辑和向后兼容性处理

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

@@ -195,8 +195,16 @@ public class CreditBankruptcyController extends BaseController {
         Set<Integer> touchedCompanyIds = new HashSet<>();
 
         try {
-            ExcelImportSupport.ImportResult<CreditBankruptcyImportParam> importResult = ExcelImportSupport.readAnySheet(
-                file, CreditBankruptcyImportParam.class, this::isEmptyImportRow);
+            // Prefer importing from the explicit tab name "破产重整" when present.
+            // This avoids accidentally importing from other sheets (e.g. "历史破产重整") in multi-sheet workbooks.
+            int sheetIndex = ExcelImportSupport.findSheetIndex(file, "破产重整");
+            ExcelImportSupport.ImportResult<CreditBankruptcyImportParam> importResult;
+            if (sheetIndex >= 0) {
+                importResult = ExcelImportSupport.read(file, CreditBankruptcyImportParam.class, this::isEmptyImportRow, sheetIndex);
+            } else {
+                // Backward compatible: try any sheet for older templates without the expected tab name.
+                importResult = ExcelImportSupport.readAnySheet(file, CreditBankruptcyImportParam.class, this::isEmptyImportRow);
+            }
             List<CreditBankruptcyImportParam> list = importResult.getData();
             int usedTitleRows = importResult.getTitleRows();
             int usedHeadRows = importResult.getHeadRows();