Added reference database building to enable fast user/domain selection:
1. Added to show_scan_menu() (lines 1447-1452):
- Builds reference database once when menu loads
- Caches all user and domain data for quick lookups
- Clears screen after building to show clean menu
- Only runs if build_reference_database function is available
2. User/Domain selection now uses cached data:
- select_user_interactive (line 1167) - uses cached user list
- Domain lookup (line 1195+) - can reference cached domain data
- Docroot matching (lines 1176-1180) - fast array lookups
Benefits:
- Fast user selection with pre-cached data
- Quick domain lookups without repeated parsing
- Efficient scanning when selecting specific users/domains
- No repeated file system queries for user information
- Consistent with other modules that use reference database
The reference database includes:
- All system users
- User domain mappings
- Docroot paths
- User metadata (disk usage, etc.)
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