Security improvements:
- Removed registration link from login page
- Disabled /auth/register route - redirects with error message
- Removed demo credentials from login page
- Added info message: 'New users are created by administrators'
UI improvements:
- Compacted all admin interface buttons (btn-sm)
- Reduced heading sizes (H2 → H4) for less visual dominance
- Shortened badge texts ('Administrator' → 'Admin', 'Benutzer' → 'User')
- Optimized spacing and reduced margins/paddings
- Cleaner, more professional admin interface
Access control:
- Only administrators can create new users via admin panel
- Self-registration completely disabled for security
- Maintains full admin functionality with improved UX
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