Add howto-modul-erstellen.md covering the full module creation workflow:
scaffold, manifest, container registration, first page, sync, validate,
and test. Includes 9 extension point examples, merge checklist, and
troubleshooting table. Documents the AuthorizationPolicy container
registration requirement (policies with constructor params must be
explicitly registered). Update make:module command output to reference
the tutorial, manifest contract, and notifications as reference module.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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5c86c56dec