fix: #3623914 Install the Web AI module in its default recipe

Rajab Natshahrequested to merge
issue/webai-3623914:install-webai into 12.0.x

Closes #3623914

The default recipe installs the AI stack and sets the providers, but not the Web AI module itself, so the module stayed disabled on every site template and its hooks never ran.

Lists webai at the end of its own install section, after its dependencies.

AI-Generated: Yes

Checkpoints

  • Issue created with a clear summary
  • Merge request opened against 12.0.x
  • CI pipeline passes

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