feat(home): add RetroArch for device "ryu" and update MPV config

Add RetroArch as a home package for devices named "ryu" and enhance MPV configuration with GPU settings. Adjust wallpaper engine service to improve performance. Add a script for enabling HDR with Steam commands.

home/apps/mpv.nix

@@ -1,6 +1,20 @@
 {pkgs, ...}: {
   programs.mpv = {
     enable = true;
+    config = {
+      vo = "gpu-next";
+      gpu-api = "vulkan";
+      # hdr-compute-peak = "yes";
+      # hdr-peak-detect = "yes";
+      # target-peak = 400;
+      # target-prim = "bt.2020";
+      # target-trc = "pq";
+      # inverse-tone-mapping = "yes";
+      # tone-mapping = "spline";
+      # tone-mapping-mode = "auto";
+      # target-colorspace-hint = "auto";
+      # gamut-mapping = "desaturate";
+    };
     package =
       if pkgs.stdenv.isLinux
       then pkgs.mpv-unwrapped.wrapper {mpv = pkgs.mpv-unwrapped.override {sixelSupport = true;};}