feat: install systemd user services to /etc/systemd/user/

- PKGBUILD installs services directly to /etc/systemd/user/ and creates
  WantedBy symlinks (no manual systemctl --user enable needed)
- Install hook cleans up legacy user-level service files from
  ~/.config/systemd/user/

moonarch-git/PKGBUILD

@@ -180,11 +180,21 @@ package() {
     install -Dm644 defaults/etc/moongreet/moongreet.toml \
         "$pkgdir/usr/share/moonarch/moongreet/moongreet.toml"
 
+    # --- Systemd user services -> /etc/systemd/user/ ---
+    install -Dm644 defaults/etc/systemd/user/*.service -t "$pkgdir/etc/systemd/user/"
+
+    # Enable services by creating the WantedBy symlinks directly
+    install -dm755 "$pkgdir/etc/systemd/user/graphical-session.target.wants"
+    for svc in defaults/etc/systemd/user/*.service; do
+        ln -sf "../$(basename "$svc")" \
+            "$pkgdir/etc/systemd/user/graphical-session.target.wants/$(basename "$svc")"
+    done
+
     # --- User config templates (for post-install.sh / transform.sh) ---
     while IFS= read -r -d '' file; do
         local _rel="${file#defaults/user/}"
         install -Dm644 "$file" "$pkgdir/usr/share/moonarch/user-defaults/$_rel"
-    done < <(find defaults/user -type f -print0)
+    done < <(find defaults/user -type f -print0 2>/dev/null || true)
 }
 
 backup=(