Add yarr: Rust MCP server for media automation fleets (Sonarr, Radarr, Prowlarr, Jellyfin, SABnzbd, qBittorrent, Plex)

Replaces the Node.js-based mcp-arr-server and jellyfin-mcp backends
in the gateway with a single Rust binary that covers both *arr and
Jellyfin. Rust binaries work through the gateway's stdio spawn
(where Node.js ones fail with 401).

packages/default.nix

@@ -28,5 +28,6 @@
   navidrome-mcp = pkgs.callPackage ./navidrome-mcp/package.nix { };
   ovhcloud-mcp = pkgs.callPackage ./ovhcloud-mcp/package.nix { };
   slskd-mcp = pkgs.callPackage ./slskd-mcp/package.nix { };
+  yarr = pkgs.callPackage ./yarr/package.nix { };
   # example-mcp-server = pkgs.callPackage ./example-mcp-server/package.nix { };
 }

packages/yarr/package.nix

@@ -0,0 +1,34 @@
+{
+  lib,
+  makeRustPlatform,
+  fetchFromGitHub,
+  rustc,
+  cargo,
+}:
+
+let
+  rustPlatform = makeRustPlatform {
+    inherit cargo rustc;
+  };
+in
+rustPlatform.buildRustPackage rec {
+  pname = "yarr";
+  version = "2.2.2";
+
+  src = fetchFromGitHub {
+    owner = "dinglebear-ai";
+    repo = "yarr";
+    rev = "15a599bab38a";
+    hash = "sha256-PlD2NYK06rVdKirUq2dw04WL9yFrM2TB1d67Weero0k=";
+  };
+
+  cargoHash = "sha256-e89uYPLqwhh1epedUvVEDTT4y35nuwLWlco4AVvKoK4=";
+
+  meta = with lib; {
+    description = "Rust MCP server for media automation fleets - Sonarr, Radarr, Prowlarr, Jellyfin, SABnzbd, qBittorrent, Plex";
+    homepage = "https://github.com/dinglebear-ai/yarr";
+    license = licenses.agpl3Only;
+    mainProgram = "yarr";
+    platforms = platforms.all;
+  };
+}