feat: Add core entities and history tables for network-club system
Core Entities:
- Add SystemConfiguration for dynamic config management
- Add ClubMembership, ClubFeature, UserClubFeature for club management
- Add NetworkWeeklyBalance for binary network tracking
- Add WeeklyCommissionPool, UserCommissionPayout for commission system
History Entities (Audit Trail):
- Add ClubMembershipHistory
- Add NetworkMembershipHistory
- Add CommissionPayoutHistory
- Add SystemConfigurationHistory
Updates to Existing Entities:
- User: Add NetworkParentId, LegPosition, and navigation properties
- UserWallet: Add NetworkBalance and DiscountBalance fields
- Products: Add IsClubExclusive and ClubDiscountPercent fields
- GlobalUsings: Add new namespaces for club/network/commission entities
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