docs: Update documentation to reflect scoped RBAC and remove org system
- Update CLAUDE.md to describe scoped RBAC instead of multi-tenant org
- Simplify README.md removing org-related features
- Update auth.md with comprehensive scoped permission documentation
- Remove configuration.md (merged into other docs)
- Update design.md with new architecture decisions
- Update integration.md with scoped auth examples
- Update UI documentation removing org references
- Update test README removing org test references
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