[Copilot]

The dependency bump to @backstage/plugin-scaffolder-backend v3.0.1 broke the build due to an incompatible alpha import path that no longer exists in the new major version.

Changes

• Removed /alpha suffix from @backstage/plugin-scaffolder-backend import in packages/backend/src/index.ts

- backend.add(import('@backstage/plugin-scaffolder-backend/alpha'));
+ backend.add(import('@backstage/plugin-scaffolder-backend'));

The v3 major version exports the plugin directly without requiring the alpha path qualifier.

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