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/stream-monaco/scripts/verifyCommit.ts

@@ -0,0 +1,30 @@
+// Invoked on the commit-msg git hook by simple-git-hooks.
+
+import { readFileSync } from 'node:fs'
+import process from 'node:process'
+import colors from 'picocolors'
+
+// get $1 from commit-msg script
+const msgPath = process.argv[2]
+const msg = readFileSync(msgPath, 'utf-8').trim()
+
+const releaseRE = /^v\d/
+const commitRE
+  = /^(?:revert: )?(?:feat|fix|docs|dx|refactor|perf|test|workflow|build|ci|chore|types|wip|release|deps)(?:\(.+\))?!?: .{1,50}/
+
+if (!releaseRE.test(msg) && !commitRE.test(msg)) {
+  console.log()
+  console.error(
+    `  ${colors.bgRed(colors.white(' ERROR '))} ${colors.red(
+      'invalid commit message format.',
+    )}\n\n${colors.red(
+      '  Proper commit message format is required for automated changelog generation. Examples:\n\n',
+    )}    ${colors.green('feat: add \'comments\' option')}\n`
+    + `    ${colors.green(
+      'fix: handle events on blur (close #28)',
+    )}\n\n${colors.red(
+      '  See .github/commit-convention.md for more details.\n',
+    )}`,
+  )
+  process.exit(1)
+}