🎨 Custom Server Homepages
- Users can now create custom server homepages with unique URLs
- Shop items displayed publicly on homepage (no login required)
- Impressum configuration in admin panel (separate page with disclaimer)
- Custom logo uploadable (or URL option)
- Discord invite URL configurable for each server
- Server name in navbar instead of impressum content
- "Back to Shop" button on impressum page
🔧 Admin-Panel UI Fixes
- "Custom Homepage" link added to sidebar
- Footer no longer overlaps content
- Sidebar categories collapsible
- JavaScript errors fixed (DOMContentLoaded)
🗄️ Database
- server_homepages table created
- invite_url column added