- Restrict /train route to admin users only (@admin_required)
- Add --server-dir command line argument for server directory configuration
- Show server local path input only for admin users when --server-dir is set
- Add /api/browse endpoint for secure file browsing (admin only)
- Implement file navigator popup with directory navigation and file selection
- Add security checks to prevent directory traversal attacks
- Update analyze template with conditional server path input and file browser modal