fix(desktop): align package version with release

apps/desktop/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@deepseek-ai/dsh-desktop",
   "description": "Electron desktop shell for an isolated pnpm-installed dsh runtime",
-  "version": "0.1.2-alpha.5",
+  "version": "0.1.2-rc.1",
   "private": true,
   "license": "MIT",
   "type": "module",