non-production: move backdraft-app to github packages

[dep]

No description provided.

[Copilot]

Pull request overview

Updates the backdraft-app package to be published/consumed as a scoped package from GitHub Packages (@invoca/backdraft-app) instead of the unscoped npm package name.

Changes:

• Rename the npm package to @invoca/backdraft-app and adjust the release script to use npm publish.
• Update README install/import examples and add GitHub Packages publishing instructions.
• Add a repo .npmrc for GitHub Packages auth/registry and update CI to use yarn install with token support.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
package.json	Renames the package to @invoca/backdraft-app; switches postversion publishing to npm publish.
README.md	Updates install/import paths and rewrites publishing guidance for GitHub Packages.
.npmrc	Configures @invoca scope to use npm.pkg.github.com with token-based auth.
.github/workflows/pipeline.yml	Switches CI dependency install to yarn install and passes GitHub token via env.

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