Fix membership payment sync, auto-send post-activation additions to cashier, and add fee calculation transparency

- Fix critical bug in Cashier bootstrap where children/temporary_members activation
  failed silently due to non-existent join_date column (only spouses have it)
- Add self-healing sync in MemberController::show() to fix historically stuck dependents
- Auto-create payment_request when adding dependents to active members (post-activation)
- Add pending additions UI section for active members showing cashier queue status
- Store fee calculation breakdowns in new fee_breakdown_json column on dependent tables
- Display expandable fee breakdowns in family tree for full calculation transparency
- Add migration Phase_65_014 for fee_breakdown_json column
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>