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/UserConfiguration.cs

@@ -31,6 +31,27 @@ public class UserConfiguration : IEntityTypeConfiguration<User>
         builder.Property(entity => entity.PushNotifications).IsRequired(true);
         builder.Property(entity => entity.BirthDate).IsRequired(false);
         builder.Property(entity => entity.HashPassword).IsRequired(false);
+        
+        // ============= Network Club System Fields =============
+        
+        builder.Property(entity => entity.NetworkParentId).IsRequired(false);
+        builder.Property(entity => entity.LegPosition).IsRequired(false);
+        
+        // رابطه با والد در شبکه باینری
+        builder
+            .HasOne(entity => entity.NetworkParent)
+            .WithMany(entity => entity.NetworkChildren)
+            .HasForeignKey(entity => entity.NetworkParentId)
+            .IsRequired(false)
+            .OnDelete(DeleteBehavior.Restrict);
+        
+        // Index برای NetworkParentId
+        builder.HasIndex(e => e.NetworkParentId)
+            .HasDatabaseName("IX_User_NetworkParentId");
+        
+        // Index برای LegPosition
+        builder.HasIndex(e => e.LegPosition)
+            .HasDatabaseName("IX_User_LegPosition");
 
     }
 }