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.
2026-06-22 11:32:57 +08:00
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+# D2 quick start
+
+D2 diagrams render progressively in markstream-vue: as soon as the syntax becomes valid, a preview appears and keeps refining as more tokens stream in. If rendering fails, the last successful preview stays visible and the source is preserved.
+
+## 1. Install & import
+
+```bash
+pnpm add @terrastruct/d2
+```
+
+No extra CSS import is required. Keep `markstream-vue/index.css` after your reset and inside `@layer components` if you use Tailwind/UnoCSS.
+
+```css
+@import 'modern-css-reset';
+
+@layer components {
+  @import 'markstream-vue/index.css';
+}
+```
+
+## 2. Streaming example
+
+```vue twoslash
+<script setup lang="ts">
+import MarkdownRender from 'markstream-vue'
+import { ref } from 'vue'
+
+const content = ref('')
+const steps = [
+  '```d2\n',
+  'direction: right\n',
+  'Client -> API: request\n',
+  'API -> DB: query\n',
+  'DB -> API: rows\n',
+  'API -> Client: response\n',
+  '```\n',
+]
+
+let i = 0
+const id = setInterval(() => {
+  content.value += steps[i] || ''
+  i++
+  if (i >= steps.length)
+    clearInterval(id)
+}, 120)
+</script>
+
+<template>
+  <MarkdownRender :content="content" />
+</template>
+```
+
+Quick try — paste this Markdown into a page or component:
+
+```md
+\`\`\`d2
+direction: right
+Client -> API: request
+API -> DB: query
+DB -> API: rows
+API -> Client: response
+\`\`\`
+```
+
+## 3. Advanced component: `D2BlockNode`
+
+Use `D2BlockNode` if you want toolbar controls (copy/export/mode toggle) or to override themes and progressive timing.
+
+```vue twoslash
+<script setup lang="ts">
+import type { D2BlockNodeProps } from 'markstream-vue'
+import { D2BlockNode } from 'markstream-vue'
+
+const node = {
+  type: 'code_block',
+  language: 'd2',
+  code: 'direction: right\nClient -> API: request\nAPI -> DB: query',
+  raw: 'direction: right\nClient -> API: request\nAPI -> DB: query',
+} satisfies D2BlockNodeProps['node']
+</script>
+
+<template>
+  <D2BlockNode :node="node" :progressive-interval-ms="500" />
+</template>
+```
+
+Props to know:
+- `progressiveRender`, `progressiveIntervalMs` control incremental re-rendering while streaming.
+- `themeId`, `darkThemeId` let you pin a D2 theme.
+- `showHeader`, `showModeToggle`, `showCopyButton`, `showExportButton`, `showCollapseButton` control the toolbar.
+
+## 4. Dark mode
+
+Pass `:is-dark="true"` (or add a `.dark` ancestor via `MarkdownRender`) to render the diagram in dark mode. markstream-vue prefers the app theme over OS preference to keep previews stable.
+
+## 5. Custom loaders (optional)
+
+If you disabled the loader earlier, or want to load from a CDN/global build:
+
+```ts twoslash
+import { enableD2, setD2Loader } from 'markstream-vue'
+
+// Re-enable the default loader
+enableD2()
+
+// Or supply your own loader
+setD2Loader(() => (window as any).D2)
+```
+
+If `@terrastruct/d2` is missing, the renderer falls back to showing the source text until it becomes available.