fix(deduction): 修复扣分项编辑时赛事ID未携带的问题

- 实体类添加competitionId字段
- Controller查询时从关联项目获取competitionId
- 修复project为null时的空指针异常

src/main/java/org/springblade/modules/martial/controller/MartialDeductionItemController.java

@@ -52,7 +52,10 @@ public class MartialDeductionItemController extends BladeController {
 		List<MartialDeductionItem> deductionItems = pages.getRecords();
 		for (MartialDeductionItem item : deductionItems) {
 			MartialProject project = martialProjectService.getById(item.getProjectId());
+			if (project != null) {
 				item.setProjectName(project.getProjectName());
+				item.setCompetitionId(project.getCompetitionId());
+			}
 		}
 		return R.data(pages);
 	}

src/main/java/org/springblade/modules/martial/pojo/entity/MartialDeductionItem.java

@@ -93,4 +93,11 @@ public class MartialDeductionItem extends TenantEntity {
 	@Schema(description = "项目名称")
 	private String projectName;
 
+	/**
+	 * 赛事ID
+	 */
+	@TableField(exist = false)
+	@Schema(description = "赛事ID")
+	private Long competitionId;
+
 }