chore(desktop-client): auto-bump version before packaging

Add scripts/bump-version.cjs and run it ahead of package:mac/win/linux
so every build gets a fresh patch version. Supports DESKTOP_VERSION for
an explicit version, or major/minor/patch via argument or
DESKTOP_VERSION_BUMP. Version moves 0.1.0 -> 0.1.1.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/desktop-client/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@geo/desktop-client",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "private": true,
   "description": "省心推客户端 — 连接和管理您的媒体账号，轻松发布和监控内容表现。",
   "author": {
@@ -16,9 +16,10 @@
     "gen:icons": "node scripts/generate-brand-icons.cjs",
     "obfuscate": "node scripts/obfuscate.cjs",
     "build:obf": "pnpm run build && pnpm run obfuscate",
-    "package:mac": "pnpm run build:obf && electron-builder --mac --arm64 --universal",
-    "package:win": "pnpm run build:obf && electron-builder --win --x64",
-    "package:linux": "pnpm run build:obf && electron-builder --linux --x64 --arm64",
+    "version:bump": "node scripts/bump-version.cjs",
+    "package:mac": "pnpm run version:bump && pnpm run build:obf && electron-builder --mac --arm64 --universal",
+    "package:win": "pnpm run version:bump && pnpm run build:obf && electron-builder --win --x64",
+    "package:linux": "pnpm run version:bump && pnpm run build:obf && electron-builder --linux --x64 --arm64",
     "sign:setup": "bash scripts/sign-setup.sh",
     "sign:mac": "bash scripts/sign-mac.sh",
     "test": "vitest run",