Convert MPV configuration to module

modules/home-manager/video/mpv/default.nix

@@ -0,0 +1,24 @@
+{ lib, config, ... }:
+with lib;
+let
+  cfg = config.modules.video.mpv;
+in
+{
+  options.modules.video.mpv = {
+    enable = mkEnableOption "enable MPV video player";
+  };
+  config = mkIf cfg.enable {
+    programs.mpv = {
+      enable = true;
+      config = {
+        hwdec = auto-safe;
+        vo = gpu;
+        profile = gpu-hq;
+        gpu-context = wayland;
+      };
+    };
+    xdg.mimeApps.defaultApplications = {
+      "video/*" = "mpv.desktop";
+    };
+  };
+}