fix: include MCPB file directly in GitHub release assets

Updates the create-release action to upload both the individual .mcpb file
and the release .zip bundle to GitHub releases. This allows users to download
the MCPB package directly without extracting the zip.

Fixes #193

Author: drernie

.github/actions/create-release/action.yml

@@ -55,6 +55,7 @@ runs:
       with:
         name: "Quilt MCP MCPB v${{ inputs.package-version }}"
         files: |
+          dist/*.mcpb
           dist/*-release.zip
         draft: false
         prerelease: ${{ contains(inputs.package-version, '-') }}