Add core seed data:
- /dbal/shared/seeds/database/users.yaml - Default system users (supergod, admin, testuser)
- /dbal/shared/seeds/database/credentials.yaml - SHA-512 hashed passwords
Add dashboard components:
- dashboard_home - User greeting with quick navigation links
- user_profile - User profile information display
- comments_list - Paginated comments list
- comment_form - Comment submission form
- irc_chat - IRC-style chat interface
These components use fakemui Material Design components and follow the
MetaBuilder JSON component schema. They provide the foundation for the
dashboard package migration from the old system.
