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/packages/markdown-parser/test/html-inline-plugin.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, it } from 'vitest'
+import { getMarkdown, parseMarkdownToStructure } from '../src'
+
+// Focus tests on the core plugin behavior added in fixHtmlInline
+
+describe('fixHtmlInline core plugin', () => {
+  it('expands single-token inline <a> with inner text', () => {
+    const md = getMarkdown()
+    const markdown = `<a href="https://example.com">Here</a>`
+    const nodes = parseMarkdownToStructure(markdown, md)
+    // nodes[0] should be paragraph with a link child
+    const para = nodes[0] as any
+    expect(para.type).toBe('paragraph')
+    const link = para.children.find((c: any) => c.type === 'link')
+    expect(link).toBeDefined()
+    expect(link.href).toBe('https://example.com')
+    expect(link.children?.[0]?.content).toBe('Here')
+  })
+
+  it('handles attribute values containing ">" inside quotes when splitting open tag', () => {
+    const md = getMarkdown()
+    const markdown = `<a href="https://example.com?q=a>b&x=1">Here</a>`
+    const nodes = parseMarkdownToStructure(markdown, md)
+    const para = nodes[0] as any
+    const link = para.children.find((c: any) => c.type === 'link')
+    expect(link).toBeDefined()
+    expect(link.href).toBe('https://example.com?q=a>b&x=1')
+    expect(link.children?.[0]?.content).toBe('Here')
+  })
+
+  it('treats void/self-closing tag inline as single html chunk (fallback to inline_code)', () => {
+    const md = getMarkdown()
+    const markdown = `before <img src="/x.png" alt="pic" /> after`
+    const nodes = parseMarkdownToStructure(markdown, md)
+    const para = nodes[0] as any
+    expect(para.type).toBe('paragraph')
+    const htmlInline = para.children.find((c: any) => c.type === 'html_inline')
+    expect(htmlInline).toBeDefined()
+    expect(htmlInline.content).toContain('<img')
+    // Ensure no weird closing tag was synthesized in output
+    expect(String(htmlInline.content)).not.toContain('</img>')
+  })
+})