Add configurable column widths (full/half) and optional descriptions
for radio/select/checkbox options on registration form fields.
- Migration adds display_width column to both tables
- FieldDisplayWidth enum with smart defaults per field type
- normalized_options accessor for backwards-compatible option format
- Portal form renderer uses display_width for VRow/VCol grid layout
- Radio/select/checkbox options render with descriptions
- Admin field editor supports display_width toggle and description input
- System templates updated with appropriate widths and descriptions
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Implement EAV system for dynamic event-specific registration fields
with organisation-level templates, person section preferences with
priority ranking, and TagSyncService for deferred tag_picker sync.
New tables: registration_field_templates, registration_form_fields,
person_field_values, person_section_preferences.
New columns: persons.remarks, events.registration_show_section_preferences,
events.registration_show_availability.
58 tests, 126 assertions — all 432 tests pass (zero regressions).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
