perf(desktop): ship a .deb instead of an 80MB AppImage

Co-authored-by: Cursor <cursoragent@cursor.com>

services/api/internal/appupdate/appupdate.go

@@ -161,9 +161,9 @@ func assetRank(kind, name string) int {
 		return 1
 	case "linux":
 		switch {
-		case strings.HasSuffix(n, ".appimage"):
-			return 3
 		case strings.HasSuffix(n, ".deb"):
+			return 3
+		case strings.HasSuffix(n, ".rpm"):
 			return 2
 		default:
 			return 1