feat(desktop): embed BoosAPI Desktop client as a subproject
Vendor the rebranded BoosAPI Desktop client (Tauri + Vue) into metapi as a monorepo subdirectory under desktop/. Source only — node_modules, dist, Cargo target and the upstream .git history are excluded. desktop/ keeps its own independent Cargo workspace (desktop/src-tauri with crates/*); it is not part of the backend boosapi crate, so a `cargo check` at the metapi root still compiles only the backend. Build the desktop app from desktop/src-tauri per desktop/README.md. Note: app icons are still placeholder assets pending the final BoosAPI logo. The updater signing keys live outside the repo and are not included.
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# MermaidBlockNode (Component)
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`MermaidBlockNode` 提供一个易于使用且可扩展的 Mermaid 渲染器,适用于需要在文档中内嵌交互式 Mermaid 图的场景。组件支持渐进式渲染、源码/预览切换、复制源码、导出 SVG,以及伪全屏查看(带缩放与拖拽)。
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## Props(关键)
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- `node: any` — Mermaid 代码节点(必须)
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- `isDark?: boolean` — 暗色模式开关
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- `loading?: boolean` — 初始加载占位
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- `maxHeight?: string | null` — 最大高度
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- `estimatedPreviewHeightPx?: number` — Mermaid 完成渲染前预留的首屏 preview 高度;通过 `MarkdownRender` 渲染 Mermaid 围栏时会自动填入
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- `isStrict?: boolean` — 开启 `securityLevel: 'strict'` + DOMPurify,并禁用 HTML labels;用于渲染不可信的 Mermaid 输入(例如用户/LLM 生成的内容),防止 `<script>`、`javascript:` 链接或内联事件落入最终 SVG
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- Header/按钮控制(全部可选,默认 `true`):
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- `showHeader` / `showModeToggle` / `showCopyButton` / `showExportButton` / `showFullscreenButton` / `showCollapseButton` / `showZoomControls` / `showTooltips`
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- `enableWheelZoom?: boolean` — 开启 Ctrl/Cmd + 滚轮缩放(默认 `false`)
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- 超时(毫秒):`workerTimeoutMs` / `parseTimeoutMs` / `renderTimeoutMs` / `fullRenderTimeoutMs`(默认 `1400/1800/2500/4000`)
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- 流式调优:`renderDebounceMs` / `contentStableDelayMs` / `previewPollDelayMs` / `previewPollMaxDelayMs` / `previewPollMaxAttempts`
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## Slots
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- `header-left` — 替换左侧(默认是 Mermaid 图标 + 标签)
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- `header-center` — 替换中间区域(默认 preview/source 切换)
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- `header-right` — 替换右侧操作按钮(完整接管默认按钮)
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## Emits
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组件发出的事件都使用统一的 `MermaidBlockEvent` 对象,支持 `preventDefault()` 来阻止组件默认行为:
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- `copy` — 点击复制按钮,处理签名:`(ev: MermaidBlockEvent<{ type: 'copy'; text: string }>)`(调用 `ev.preventDefault()` 可阻止组件默认的复制到剪贴板与 “Copied” 状态)
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- `export` — 导出按钮点击,处理签名:`(ev: MermaidBlockEvent<{ type: 'export' }>)`
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- `openModal` — 请求打开 pseudo-fullscreen,处理签名:`(ev: MermaidBlockEvent<{ type: 'open-modal' }>)`(组件内部 emit 名称为 `openModal`)
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- `toggleMode` — 切换 `source | preview`,处理签名:`(target: 'source' | 'preview', ev: MermaidBlockEvent<{ type: 'toggle-mode'; target: 'source' | 'preview' }>)`(组件内部 emit 名称为 `toggleMode`)
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### 拦截示例
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完全替换组件默认导出行为:
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```vue
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<script setup lang="ts">
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import type { MermaidBlockEvent } from 'markstream-vue'
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import { MermaidBlockNode } from 'markstream-vue'
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function onExport(ev: any /* MermaidBlockEvent */) {
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ev.preventDefault()
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// 组件在事件对象中暴露了 svgElement,直接使用它更方便
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const svgEl = ev.svgElement as SVGElement | null
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if (!svgEl) {
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console.warn('No svg element available')
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return
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}
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const svgString = new XMLSerializer().serializeToString(svgEl)
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uploadSvg(svgString)
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}
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</script>
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<template>
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<MermaidBlockNode :node="node" @export="onExport" />
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</template>
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```
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> 注意:`export` / `openModal` 事件的事件对象现已同时包含 `svgElement`(DOM 节点)和 `svgString`(已序列化的 SVG 字符串),任选其一使用更方便。
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## Slot 示例:完全接管右侧操作按钮
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```vue
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<MermaidBlockNode :node="node" :showExportButton="false">
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<template #header-right>
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<button @click="downloadSvg">Download</button>
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<button @click="openCustomModal">Open custom modal</button>
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</template>
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</MermaidBlockNode>
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```
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## 推荐用法
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- 如果你要实现自定义导出/上传,最佳做法是:在 `export` 监听器中 `preventDefault()`,并在监听回调中直接从组件渲染的 DOM 中读取 `svg`。
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- 如果你想要完全替换头部的 UI,使用 `header-*` 插槽并把相应 `show*` props 设为 `false` 来隐藏默认按钮。
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- 若 Mermaid 内容来自用户/LLM 或任何不可信来源,建议加上 `:is-strict="true"`,组件会对 SVG 进行清理并禁用 HTML labels,从而堵住恶意 `<script>` 或 `javascript:` 链接注入的风险。
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## 参考
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- 覆盖 `MermaidBlockNode`(在 `MarkdownRender` 中使用 `setCustomComponents`)的示例(中文):[覆盖 MermaidBlockNode(MarkdownRender 示例)](./mermaid-block-node-override.md)
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Playground 示例:仓库包含一个可运行的 playground 页面演示如何拦截 `export` 并上传 `ev.svgString` —— 路由: `mermaid-export-demo` (文件:`playground/src/pages/mermaid-export-demo.vue`)。
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