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/netlify.toml

@@ -0,0 +1,14 @@
+[build]
+# Default Netlify build: build the markdown docs
+command = "pnpm install --frozen-lockfile && pnpm run build:parser && pnpm run build && pnpm docs:build"
+publish = "docs/.vitepress/dist"
+
+[build.environment]
+NODE_VERSION = "22"
+# The VitePress base should usually be '/' for Netlify; set this if you deploy under a subpath
+VITEPRESS_BASE = "/"
+
+# Deploy the playground in preview builds (optional) so authors can preview the demo app
+[context.deploy-preview]
+command = "pnpm run play:build"
+publish = "playground/dist"