Method update_pr

scripts/lyric_checker_bot/src/github_api.rs:504–555

(&self, context: &PrUpdateContext<'_>)

    }

    pub async fn update_pr(&self, context: &PrUpdateContext<'_>) -> Result<()> {
        info!(
            "正在处理来自 @{} 的更新 PR #{} 请求...",
            context.requester, context.pr_number
        );

        let Some(pr) = self
            .verify_pr_permission(context.pr_number, context.requester)
            .await?
        else {
            return Ok(());
        };

        let file_to_update = self
            .find_target_file(context.pr_number, context.root_path)
            .await?;

        let branch_name = &pr.head.ref_field;
        let changes_made = self
            .execute_git_changes(branch_name, &file_to_update, context)
            .await?;

        if !changes_made {
            return Ok(());
        }

        if let Err(e) = self.refresh_pr_metadata(&pr, context).await {
            warn!("更新 PR #{} 元数据失败: {:?}", context.pr_number, e);
        }

        self.send_feedback_reaction(context.comment_id).await;

        // 用户用 /update 更新歌词后，如果有 “待更新” 标签则移除它
        if let Some(labels) = &pr.labels
            && labels.iter().any(|l| l.name == PENDING_UPDATE_LABEL)
        {
            info!("在更新后找到 “{PENDING_UPDATE_LABEL}” 标签, 正在尝试移除");
            if let Err(e) = self
                .client
                .issues(&self.owner, &self.repo)
                .remove_label(context.pr_number, PENDING_UPDATE_LABEL)
                .await
            {
                warn!("移除标签失败: {e:?}");
            } else {
                info!("已移除 “{PENDING_UPDATE_LABEL}” 标签");
            }
        }

        info!("成功更新 PR #{}", context.pr_number);
        Ok(())
    }

    async fn find_target_file(
        &self,