feat(bluetooth): add 'mpris-proxy' service

modules/bluetooth/default.nix

@@ -1,3 +1,5 @@
+{ pkgs, ... }:
+
 {
   hardware.bluetooth = {
     enable = true;
@@ -12,4 +14,14 @@
       };
     };
   };
+
+  systemd.user.services.mpris-proxy = {
+    description = "Mpris proxy";
+    after = [
+      "network.target"
+      "sound.target"
+    ];
+    wantedBy = [ "default.target" ];
+    serviceConfig.ExecStart = "${pkgs.bluez}/bin/mpris-proxy";
+  };
 }