#40183 feat(apps): export ENGINE_VERSION from definition layer

Proposed changes (including videos or screenshots)

Adds src/definition/version.ts which reads the package version via resolveJsonModule and exports it as ENGINE_VERSION.

Replaces AppPackageParser.getEngineVersion() — which resolved the version by traversing the filesystem relative to __dirname — with a direct import of ENGINE_VERSION. This removes the assumption that package.json lives at a predictable relative path, which will break when AppPackageParser moves to a different package during the
apps-engine split.

Issue(s)

Steps to test or reproduce

Further comments

Related to the "Apps-Engine split" stack:

• #40395
• This PR
• #40184
• #40185
• #40186
• #40343

Deprecated

• #40187

Summary by CodeRabbit

• Refactor
  • Engine version is now fixed at build time rather than discovered at runtime, improving startup reliability and consistency and reducing runtime file access.
• Chores
  • Build configuration updated to support JSON imports, making builds and version handling more robust.
• Documentation
  • Migration guide updated to reflect the new version-handling approach.