feat: Add EF configurations and migration for network-club system

EF Core Configurations (11 files):
- SystemConfigurationConfiguration with Scope+Key composite index
- ClubMembershipConfiguration with one-to-one User relationship
- ClubFeatureConfiguration with IsActive+SortOrder index
- UserClubFeatureConfiguration with composite unique index
- NetworkWeeklyBalanceConfiguration with UserId+WeekNumber index
- WeeklyCommissionPoolConfiguration with unique WeekNumber
- UserCommissionPayoutConfiguration with multiple indexes
- ClubMembershipHistoryConfiguration for audit trail
- NetworkMembershipHistoryConfiguration for audit trail
- CommissionPayoutHistoryConfiguration for audit trail
- SystemConfigurationHistoryConfiguration for audit trail

Configuration Updates:
- UserConfiguration: Add NetworkParentId, LegPosition with indexes
- UserWalletConfiguration: Add DiscountBalance field
- ProductsConfiguration: Add IsClubExclusive, ClubDiscountPercent with index

Infrastructure Updates:
- ApplicationDbContext: Add 11 new DbSets for network-club entities
- GlobalUsings: Add Domain entity namespaces

Migration:
- AddNetworkClubSystemV2: Complete database schema for network-club system

src/CMSMicroservice.Infrastructure/Persistence/Configurations/UserWalletConfiguration.cs

@@ -18,6 +18,7 @@ public class UserWalletConfiguration : IEntityTypeConfiguration<UserWallet>
             .IsRequired(true);
         builder.Property(entity => entity.Balance).IsRequired(true);
         builder.Property(entity => entity.NetworkBalance).IsRequired(true);
+        builder.Property(entity => entity.DiscountBalance).IsRequired(true);
 
     }
 }