feat: 项目编码自动生成

- 新增项目时自动生成编码，格式: C{赛事ID}-P{序号}
- 移除手动输入项目编码

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

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

@@ -1,5 +1,6 @@
 package org.springblade.modules.martial.controller;
 
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import io.swagger.v3.oas.annotations.Operation;
@@ -78,9 +79,32 @@ public class MartialProjectController extends BladeController {
 	@PostMapping("/submit")
 	@Operation(summary = "新增或修改", description = "传入实体")
 	public R submit(@RequestBody MartialProject project) {
+		// Auto-generate project code for new projects
+		if (project.getId() == null && StringUtil.isBlank(project.getProjectCode())) {
+			String projectCode = generateProjectCode(project.getCompetitionId());
+			project.setProjectCode(projectCode);
+		}
 		return R.status(projectService.saveOrUpdate(project));
 	}
 
+	/**
+	 * Generate project code: competition prefix + sequence number
+	 * Format: C{competitionId}-P{sequence}, e.g., C1-P001
+	 */
+	private String generateProjectCode(Long competitionId) {
+		if (competitionId == null) {
+			return "P" + System.currentTimeMillis();
+		}
+		
+		// Count existing projects for this competition
+		LambdaQueryWrapper<MartialProject> wrapper = new LambdaQueryWrapper<>();
+		wrapper.eq(MartialProject::getCompetitionId, competitionId);
+		long count = projectService.count(wrapper);
+		
+		// Generate code: C{competitionId}-P{sequence}
+		return String.format("C%d-P%03d", competitionId, count + 1);
+	}
+
 	/**
 	 * 删除
 	 */