chore(packaging): remove systemd service from PKGBUILD, bump pkgrel

The app now uses XDG autostart (~/.config/autostart/umutray.desktop)
managed via the Settings panel, not systemd. The service file is no
longer installed by the package.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packaging/PKGBUILD

@@ -12,7 +12,7 @@
 
 pkgname=umutray
 pkgver=0.1.0
-pkgrel=1
+pkgrel=2
 pkgdesc='Tray-based Wine launcher manager for Linux via umu/Proton-GE'
 arch=('x86_64')
 url='https://git.aleshym.co/funman300/umutray'
@@ -56,10 +56,6 @@ package() {
     sed -i "s|Exec=umutray|Exec=/usr/bin/umutray|" \
         "$pkgdir/usr/share/applications/umutray.desktop"
 
-    # Systemd user service (static file — no runtime generation needed)
-    install -Dm644 umutray.service \
-        "$pkgdir/usr/lib/systemd/user/umutray.service"
-
     # License
     install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
 }