refactor(prompts-core): 重构代码结构和优化工具函数

service/prompt/prompt_files_handle_service.go

@@ -190,6 +190,9 @@ func fetchFileContent(ctx context.Context, client *http.Client, url string) (str
 }
 
 func SkillMdContent(ctx context.Context, skillName string) string {
+	if skillName == "" {
+		return ""
+	}
 	skillResp, err := gateway.GetSkillUser(ctx, skillName)
 	if err != nil {
 		g.Log().Warningf(ctx, "[SkillMd] GetSkillUser 失败: %v", err)