Add audiobookshelf-mcp package

Go binary from michaeldvinci/audiobookshelf-mcp (v0.0.5).
Covers libraries, audiobooks, podcasts, authors, collections,
playlists, and users. Uses buildGoModule with fakeHash placeholders
to be filled on first nix build.

packages/audiobookshelf-mcp/package.nix

@@ -0,0 +1,27 @@
+{
+  lib,
+  buildGoModule,
+  fetchFromGitHub,
+}:
+
+buildGoModule rec {
+  pname = "audiobookshelf-mcp";
+  version = "unstable-2026-06-27";
+
+  src = fetchFromGitHub {
+    owner = "michaeldvinci";
+    repo = "audiobookshelf-mcp";
+    rev = "e790d9c75085772180c95f2ec1376acc98e9282c";
+    hash = lib.fakeHash;
+  };
+
+  vendorHash = lib.fakeHash;
+
+  meta = with lib; {
+    description = "MCP server for Audiobookshelf — libraries, audiobooks, podcasts, authors, collections, playlists";
+    homepage = "https://github.com/michaeldvinci/audiobookshelf-mcp";
+    license = licenses.gpl3Only;
+    mainProgram = "abs-mcp";
+    platforms = platforms.all;
+  };
+}

packages/default.nix

@@ -20,5 +20,6 @@
   mcp-score = pkgs.callPackage ./mcp-score/package.nix { };
   applemusic-mcp = pkgs.callPackage ./applemusic-mcp/package.nix { };
   pinchflat-mcp = pkgs.callPackage ./pinchflat-mcp/package.nix { };
+  audiobookshelf-mcp = pkgs.callPackage ./audiobookshelf-mcp/package.nix { };
   # example-mcp-server = pkgs.callPackage ./example-mcp-server/package.nix { };
 }