Add desktop (Electron) packaging and release distribution (#1147)

* Add desktop packaging workflow

* Add desktop package homepage

* Fix desktop default credential prompt

* Suppress default credential prompt on desktop

* Publish desktop artifacts on release; reduce CI to PR smoke test

Add desktop-release.yml triggered on release publish (mirroring
docker-publish.yml) to build all platforms and upload .dmg/.exe/
.AppImage/.deb to the GitHub Release.

Trim build.yml desktop job to a PR-only Linux x64 smoke test, since
release artifacts are now produced by desktop-release.yml. This drops
per-push and macOS/Windows packaging from regular CI.

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

* Fix desktop Hermes data home on Windows

---------

Co-authored-by: xingzhi <chuzihao.czh@alibaba-inc.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -24,6 +24,10 @@ pnpm-workspace.yaml
 packages/server/data/
 packages/server/node_modules/
 .hermes-web-ui/
+packages/desktop/dist/
+packages/desktop/release/
+packages/desktop/resources/python/
+packages/desktop/node_modules/
 
 # Hermes config files (should be in user data directory, not project root)
 config.yaml