fix(frontend): 修复 Docker 部署下图片路径 & 子路由刷新问题#387
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后端存储的 Markdown 图片使用根相对路径（/static/screenshots/...），
前端预览时临时补后端地址可以正常显示，但复制和下载直接使用了原始
相对路径，粘贴到外部 Markdown 工具后图片全部失效。
修复方案：
- 新增 getBackendOrigin() 安全获取后端 origin，替代脆弱的 replace('/api', '')
- 新增 toPortableMarkdown() 将根相对图片路径转为绝对 URL
- Web 前端和扩展端所有复制/下载入口统一走转换函数
- 扩展端 absolutizeMarkdownImages 正则扩大为所有根相对路径，并排除 // 协议相对 URL
Docker 构建时 base: './' 导致资源使用相对路径，在 /settings 等 子路由刷新时浏览器将 ./assets/xxx.js 解析到错误路径，JS 加载失败。 改为 Docker 构建时使用 base: '/'（绝对路径），本地/Tauri 保持 './'。
## Root Cause
Markdown 缓存写入时机错误。缓存文件在 中写入的是 GPT
原始输出（含 *Screenshot-[mm:ss] 标记），但截图 URL 替换发生在后续的
中。导致：
- 首次显示：前端拿到内存中最终处理过的 Markdown，截图正常
- 刷新页面：前端从缓存读到未经替换的原始 Markdown，截图丢失
## Fixes
1. note.py: 在 _post_process_markdown 后会写 Markdown 缓存，
确保缓存保存的是含  的最终版本
2. screenshot_marker.py: 正则 \d{2} → \d{1,2}，兼容 LLM 输出的 1-digit 时间格式
3. prompt_builder.py: 增强 Prompt 格式约束，明确要求两位数字
4. test_screenshot_marker.py: 新增 6 个测试用例覆盖 1-digit 时间等边缘情况
Author
补充修复：截图刷新后 404之前这个 PR 只修复了前端的图片路径问题，但没有解决后端缓存导致的核心 bug。 根因
新增改动（3dc3ccb）
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Summary
Details
'./'切换为'/'，前端 Dockerfile 新增ENV DOCKER_BUILD=1Test plan
/settings等子路由不再白屏