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.

desktop/libs/markstream-vue/test/plugins/containers-plugin.test.ts

@@ -0,0 +1,45 @@
+import { getMarkdown, parseMarkdownToStructure } from 'stream-markdown-parser'
+import { describe, expect, it } from 'vitest'
+
+describe('containers plugin', () => {
+  it('renders admonition container via ::: admonition', () => {
+    const md = getMarkdown('t')
+    const content = `::: note\nThis is a note\n:::`
+    const html = md.render(content)
+    expect(html).toContain('vmr-container-note')
+    expect(html).toContain('This is a note')
+  })
+
+  it('renders multiple container types', () => {
+    const md = getMarkdown('t')
+    const content = `::: warning\nWarn\n:::\n\n::: tip\nTip\n:::`
+    const html = md.render(content)
+    expect(html).toContain('vmr-container-warning')
+    expect(html).toContain('vmr-container-tip')
+  })
+
+  it('renders warning block with expected HTML structure', () => {
+    const md = getMarkdown('play')
+    const content = `::: warning\n这是一个警告块。\n:::`
+    const html = md.render(content)
+    // exact wrapper class
+    expect(html).toContain('class="vmr-container vmr-container-warning"')
+    // contains paragraph with content
+    expect(html).toContain('<p>这是一个警告块。</p>')
+  })
+
+  it('preserves original markdown inside container', () => {
+    const md = getMarkdown('t')
+    const content = `::: note-test \n# head text\n:::`
+    const tokens = parseMarkdownToStructure(content, md)
+
+    // the raw should contain the markdown `# head text`
+    expect(tokens).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          raw: expect.stringContaining('#'),
+        }),
+      ]),
+    )
+  })
+})

desktop/libs/markstream-vue/test/plugins/fence-streaming.test.ts

@@ -0,0 +1,30 @@
+import { getMarkdown } from 'stream-markdown-parser'
+import { describe, expect, it } from 'vitest'
+
+function extractFenceTokens(md: ReturnType<typeof getMarkdown>, src: string) {
+  const tokens = md.parse(src, {}) as any[]
+  return tokens.filter((t: any) => t.type === 'fence')
+}
+
+describe('fence streaming plugin', () => {
+  it('sets closed=true for closed ``` fences', () => {
+    const md = getMarkdown('t')
+    const src = '```ts\nconst a=1\n```\n'
+    const [f] = extractFenceTokens(md, src)
+    expect(f?.meta?.closed).toBe(true)
+  })
+
+  it('sets closed=false for unclosed ``` fences', () => {
+    const md = getMarkdown('t')
+    const src = '```ts\nconst a=1\n' // no closing fence
+    const [f] = extractFenceTokens(md, src)
+    expect(f?.meta?.closed).toBe(false)
+  })
+
+  it('supports ~~~ fences and closed detection', () => {
+    const md = getMarkdown('t')
+    const src = '~~~js\nlet x=1\n~~~\n'
+    const [f] = extractFenceTokens(md, src)
+    expect(f?.meta?.closed).toBe(true)
+  })
+})

desktop/libs/markstream-vue/test/plugins/math-plugin.test.ts

@@ -0,0 +1,70 @@
+import { getMarkdown } from 'stream-markdown-parser'
+import { describe, expect, it } from 'vitest'
+
+describe('math plugin (inline & block)', () => {
+  it('parses inline $...$ and ( ... ) maths', () => {
+    const md = getMarkdown('t')
+    const content = '这是行内数学 $a+b=3$ 和另外一种 \\(--x\\)'
+    const html = md.render(content)
+
+    // Should render math inline - either our inline wrapper or MathJax output or raw content
+    const ok
+      = html.includes('vmr-math-inline')
+        || html.includes('math')
+        || html.includes('a+b=3')
+
+    expect(ok).toBe(true)
+  })
+
+  it('parses block $$...$$ maths', () => {
+    const md = getMarkdown('t')
+    const content = `前文\n$$\nE=mc^2\n$$\n后文`
+    const tokens = md.parse(content, {})
+    const blocks = tokens.filter((t: any) => t.type === 'math_block')
+    expect(blocks.length).toBe(1)
+    expect(blocks[0].content).toContain('E=mc^2')
+  })
+
+  it('does not treat escaped dollar as math', () => {
+    const md = getMarkdown('t')
+    const content = 'price is $5 and not math $not$'
+    const tokens = md.parse(content, {})
+    const inline = tokens
+      .flatMap((t: any) => (t.children ? t.children : []))
+      .filter(
+        (c: any) =>
+          c && (c.type === 'vmr_math_inline' || c.type === 'math_inline'),
+      )
+    // Expect none (we may get tokens as text)
+    expect(inline.length).toBeLessThanOrEqual(1)
+  })
+
+  it('parses inline math in content', () => {
+    const md = getMarkdown('t')
+    const content = '- **二项式展开**（\(\(m\) 为实数）：'
+    const tokens = md.parse(content, {})
+    const inline = tokens.filter(token => token.type === 'inline')[0]
+    console.log({ children: inline.children })
+    expect(inline.content).toBe('**二项式展开**（((m) 为实数）：')
+    expect(inline.children?.slice(-1)[0].content).toMatchInlineSnapshot(`"（((m) 为实数）："`)
+  })
+
+  it('parses list_item', () => {
+    const md = getMarkdown('t')
+    const content = '- \\*'
+    const tokens = md.parse(content, {})
+    console.log({ tokens })
+    const types = tokens.map(t => t.type)
+    expect(types).toMatchInlineSnapshot(`
+      [
+        "bullet_list_open",
+        "list_item_open",
+        "paragraph_open",
+        "inline",
+        "paragraph_close",
+        "list_item_close",
+        "bullet_list_close",
+      ]
+    `)
+  })
+})