Feat/angular lang scaffold

[muhammedgider]

Summary

This PR adds an initial @openuidev/angular-lang package for rendering OpenUI Lang in Angular applications, along with an Angular example app and test coverage for the core runtime behaviors.

It also fixes package distribution for @openuidev/angular-lang so the built package can be packed and installed correctly from the generated dist/angular-lang output.

Included

• add @openuidev/angular-lang
• add Angular example app under examples/app-frameworks/angular
• add tests for:
  • component library creation
  • streaming renderer behavior
  • state hydration and updates
  • actions
  • query loading and mutations
  • render-error handling
  • validation/context helpers
• add packaging fix for Angular dist output
  • build now patches dist/angular-lang/package.json
  • pack:check verifies npm pack --dry-run against the dist package

Packaging fix

Before this change, @openuidev/angular-lang built successfully but the packed tarball did not include the generated FESM/types output because the package root and dist output layout did not align.

This PR adds scripts/prepare-angular-lang-dist.mjs and wires it into the Angular package build to make the generated dist package publish/install-safe.

Verification

Ran:

• pnpm --filter @openuidev/angular-lang run build
• pnpm --filter @openuidev/angular-lang run pack:check

Also verified that the produced tarball can be installed in a clean temporary project.

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