feat(报告下载): 实现报告文件下载功能并增强任务状态管理

[HKLHaoBin]

• 在ReportAgent中修改generate_report返回包含文件路径的字典
• 在ReportTask中添加文件路径相关字段
• 新增/download接口用于下载报告文件
• 在前端添加下载按钮及相关控制逻辑
• 完善任务状态显示，增加文件路径信息

[ghmark675]

pr前请查看仓库目录下的CONTRIBUTING.md，基于dev分支进行修改，pr目标分支也应该是dev分支

[HKLHaoBin]

好的，我明白了

[HKLHaoBin]

git checkout -q --track upstream/dev fatal: Unable to create 'D:/编程/BettaFish/.git/index.lock': File exists.

Another git process seems to be running in this repository, e.g. an editor opened by 'git commit'. Please make sure all processes are terminated then try again. If it still fails, a git process may have crashed in this repository earlier: remove the file manually to continue.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[HKLHaoBin]

好了，我重新提交了 基于 dev 的更改

[HKLHaoBin]

这个就关闭了