Add required name field (min 2 chars) to all registration forms to fix
Better Auth validation error. Updates backend DTO, shared-auth service,
shared-auth-ui RegisterPage component, i18n translations, and all app
auth stores and register pages.
- Move finance, mail, moodlit to apps-archived for later development
- Rename games/voxel-lava to games/voxelava
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Co-Authored-By: Claude <noreply@anthropic.com>