Add multi-guild Discord bot support with auto-setup
- Bot creates category and channels automatically when joining a server
- Channel structure: info, status, alerts, updates, diskussion, requests (forum)
- Add guild_settings database table for per-server configuration
- Add Discord bot invite button to Dashboard
- Add display settings API functions
- Add comprehensive Discord bot documentation
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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