Add romarr-mcp: curated MCP server for ROMarr

packages/romarr-mcp/package.nix

@@ -0,0 +1,37 @@
+{
+  lib,
+  stdenv,
+  python3,
+  makeWrapper,
+}:
+
+stdenv.mkDerivation {
+  pname = "romarr-mcp";
+  version = "1.0.0";
+
+  src = ./.;
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  dontBuild = true;
+  dontConfigure = true;
+
+  # Single stdlib-only file: no wheels to vendor, no interpreter to pin beyond
+  # the python3 in nixpkgs. ROMarr's own API is reached over plain HTTP(S).
+  installPhase = ''
+    runHook preInstall
+    mkdir -p $out/lib/romarr-mcp $out/bin
+    install -m644 romarr_mcp.py $out/lib/romarr-mcp/romarr_mcp.py
+    makeWrapper ${python3}/bin/python3 $out/bin/romarr-mcp \
+      --add-flags "$out/lib/romarr-mcp/romarr_mcp.py"
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "MCP server for ROMarr: library, wanted, queue, indexer search, DAT audit";
+    homepage = "https://github.com/BlizzHacker/romarr";
+    license = licenses.mit;
+    mainProgram = "romarr-mcp";
+    platforms = platforms.all;
+  };
+}