feat: remove start.sh script and add appearance preferences management
- Deleted the start.sh script for container management. - Added AGENTS.md for project guidelines and development principles. - Introduced new SQL migration files for user appearance preferences and platform settings. - Implemented appearance provider to manage user interface themes and preferences. - Created branding utility to define and manage branding-related constants and types. Co-authored-by: Copilot <copilot@github.com>
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