Live deploy console: stream compose up output to the browser (0.22.0)

Deploying a local stack from the editor now opens a console modal that streams
the `docker compose up -d` output (image pulls, container creation) live over a
new `/ws/deploy/{stack_id}` WebSocket, replacing the blind "Deploying…" spinner.
The compose subprocess keeps running server-side if the modal is closed early;
the same audit entry + start/error notification as the REST start path is recorded.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "stackpilot-frontend",
   "private": true,
-  "version": "0.21.6",
+  "version": "0.22.0",
   "type": "module",
   "scripts": {
     "dev": "vite",