delete libvirt python fix and downgraded qemu-full to prevent recompilation every time

overlays/libvirt-python313-fix/default.nix

@@ -1,28 +0,0 @@
-{ ... }:
-
-final: prev:
-let
-  python313ForCeph =
-    let
-      base = final.python313;
-    in
-    base
-    // {
-      override = args:
-        base.override (args // {
-          packageOverrides = self: super:
-            (if args ? packageOverrides then args.packageOverrides self super else { })
-            // {
-              # Ceph still references cython_0 in nixpkgs; map it to modern cython on py3.13.
-              cython_0 = super.cython;
-            };
-        });
-    };
-in {
-  # Work around nixos-unstable eval failure:
-  # sphinx-9.1.0 not supported for interpreter python3.11
-  # (seen through libvirtd -> qemu_full -> ceph Python dependency chain).
-  ceph = prev.ceph.override {
-    python311 = python313ForCeph;
-  };
-}

systems/x86_64-linux/drivebystation-nix/configuration.nix

@@ -171,9 +171,7 @@
   virtualisation.libvirtd = {
     enable = true;
     qemu = {
-      package = pkgs.qemu_full.override {
+      package = pkgs.qemu;
-        cephSupport = false;
-      };
       runAsRoot = true;
       swtpm.enable = true;
       vhostUserPackages = [ pkgs.virtiofsd ];