masoodafar-web 0e61513b0e docs: add ClubMembershipCycle table to preserve activation date
Problem: ActivateClubMembership overwrites ActivatedAt on re-purchase,
losing the original club activation date. Commission check uses
ActivatedAt to determine 'new member this week'.

Solution: New ClubMembershipCycle table
- Each package purchase creates a new cycle record
- ClubMembership.ActivatedAt = first-time only (never overwritten)
- Commission uses Cycle.PackagePurchasedAt instead of ActivatedAt
- IsCurrentCycle flag tracks active cycle
- Full history preserved for all purchase cycles

Also updated:
- SPEC: section 7.5 (entity), 7.6 (migration), 8.2 (SP change), 8.3 (handler)
- PLAN: phase 1 (entity), phase 2 (activate handler), phase 4 (date query)
- Checklist: added 4 new items
2026-02-19 02:58:14 +03:30
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