feat(moonarch-git): stage + deploy mpv configs via post_install

Stages defaults/etc/mpv/ to /usr/share/moonarch/mpv/ and copies
mpv.conf + modernz.conf into /etc/mpv/ on install. modernz.conf
deliberately overwrites the AUR default from mpv-modernz-git.
pkgrel bumped to 11.

moonarch-git/PKGBUILD

@@ -5,7 +5,7 @@
 
 pkgname=moonarch-git
 pkgver=r116.d5c1b8a
-pkgrel=10
+pkgrel=11
 pkgdesc="Moonarch desktop environment defaults — Niri, Waybar, Catppuccin Mocha"
 arch=('any')
 url="https://gitea.moonarch.de/nevaforget/moonarch"
@@ -195,6 +195,12 @@ package() {
     install -Dm644 defaults/xdg/swaync/style.css \
         "$pkgdir/usr/share/moonarch/swaync/style.css"
 
+    # --- mpv configs (deployed by .install, modernz.conf owned by mpv-modernz-git) ---
+    install -Dm644 defaults/etc/mpv/mpv.conf \
+        "$pkgdir/usr/share/moonarch/mpv/mpv.conf"
+    install -Dm644 defaults/etc/mpv/script-opts/modernz.conf \
+        "$pkgdir/usr/share/moonarch/mpv/modernz.conf"
+
     # --- Reference configs for greetd/moongreet (deployed by .install, not owned) ---
     install -Dm644 defaults/etc/greetd/config.toml \
         "$pkgdir/usr/share/moonarch/greetd/config.toml"