Documentation updates#8

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andreasdotorg wants to merge 8 commits intoengelsystem:mainfrom

andreasdotorg:documentation-updates

Commits on Jan 1, 2026

Add comprehensive documentation (EN + DE)
Gabriela Bogk
committed
Fix multilingual navigation and duplicate headers
Gabriela Bogk
committed
Improve admin and developer documentation quality
Gabriela Bogk
committed
Comprehensive role management documentation
Gabriela Bogk
committed
Add German translations for admin and developer sections
Gabriela Bogk
committed
Documentation reconciliation: align structure with permission system
Gabriela Bogk
committed
Fix style violations in welcome-angel, voucher-angel, goodie-manager docs
Gabriela Bogk
committed
Apply comprehensive style audit across all documentation
Gabriela Bogk
committed