chore(packages): Remove unused vulkan-hdr-layer package

The vulkan-hdr-layer package was not used anywhere in the configuration.
Removing it to reduce maintenance burden.

packages/default.nix

@@ -1,6 +1,5 @@
 { pkgs, ... }:
 {
-  vulkanHDRLayer = pkgs.callPackage ./vulkan-hdr-layer {};
   tea-rbw = pkgs.callPackage ./tea-rbw {};
   app-launcher-server = pkgs.callPackage ./app-launcher-server {};
   claude-code = pkgs.callPackage ./claude-code {};

packages/vulkan-hdr-layer/default.nix

@@ -1,34 +0,0 @@
-{ lib, stdenv, fetchFromGitHub, meson, pkg-config, vulkan-loader, ninja, writeText, vulkan-headers, vulkan-utility-libraries,  jq, libX11, libXrandr, libxcb, wayland, wayland-scanner }:
-
-stdenv.mkDerivation rec {
-  pname = "vulkan-hdr-layer";
-  version = "63d2eec";
-
-  src = (fetchFromGitHub {
-    owner = "Zamundaaa";
-    repo = "VK_hdr_layer";
-    rev = "869199cd2746e7f69cf19955153080842b6dacfc";
-    fetchSubmodules = true;
-    hash = "sha256-xfVYI+Aajmnf3BTaY2Ysg5fyDO6SwDFGyU0L+F+E3is=";
-  }).overrideAttrs (_: {
-    GIT_CONFIG_COUNT = 1;
-    GIT_CONFIG_KEY_0 = "url.https://github.com/.insteadOf";
-    GIT_CONFIG_VALUE_0 = "git@github.com:";
-  });
-
-  nativeBuildInputs = [ vulkan-headers meson ninja pkg-config jq ];
-
-  buildInputs = [ vulkan-headers vulkan-loader vulkan-utility-libraries libX11 libXrandr libxcb wayland wayland-scanner ];
-
-  # Help vulkan-loader find the validation layers
-  setupHook = writeText "setup-hook" ''
-    addToSearchPath XDG_DATA_DIRS @out@/share
-  '';
-
-  meta = with lib; {
-    description = "Layers providing Vulkan HDR";
-    homepage = "https://github.com/Zamundaaa/VK_hdr_layer";
-    platforms = platforms.linux;
-    license = licenses.mit;
-  };
-}