refactor: reorganize Nix configuration and reintroduce Waydroid service

- Update Nix configuration files to improve structure and readability
- Reintroduce Waydroid service configuration in common/default.nix
- Adjust formatting for consistency across home-manager and host configurations

hosts/common/default.nix

@@ -82,6 +82,18 @@
       pkgs.libwacom
       pkgs.nitrokey-udev-rules
     ];
+    waydroid-config = {
+      description = "Configure Waydroid Properties";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "waydroid-container.service" ];
+      serviceConfig = {
+        Type = "oneshot";
+        ExecStart = pkgs.writeShellScript "waydroid-config" ''
+          echo "ro.hardware.gralloc=default" >> /var/lib/waydroid/waydroid_base.prop
+          echo "ro.hardware.egl=swiftshader" >> /var/lib/waydroid/waydroid_base.prop
+        '';
+      };
+    };
   };
   users.groups.scard = { };