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/UserClubFeatureConfiguration.cs

@@ -0,0 +1,52 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace CMSMicroservice.Infrastructure.Persistence.Configurations;
+
+/// <summary>
+/// جدول واسط کاربر-فیچر
+/// </summary>
+public class UserClubFeatureConfiguration : IEntityTypeConfiguration<UserClubFeature>
+{
+    public void Configure(EntityTypeBuilder<UserClubFeature> builder)
+    {
+        builder.HasQueryFilter(p => !p.IsDeleted);
+        builder.Ignore(entity => entity.DomainEvents);
+        
+        builder.HasKey(entity => entity.Id);
+        builder.Property(entity => entity.Id).UseIdentityColumn();
+        
+        builder.Property(entity => entity.UserId).IsRequired();
+        builder.Property(entity => entity.ClubMembershipId).IsRequired();
+        builder.Property(entity => entity.ClubFeatureId).IsRequired();
+        builder.Property(entity => entity.GrantedAt).IsRequired();
+        builder.Property(entity => entity.Notes).IsRequired(false).HasMaxLength(500);
+        
+        // رابطه با User
+        builder.HasOne(entity => entity.User)
+            .WithMany(u => u.UserClubFeatures)
+            .HasForeignKey(entity => entity.UserId)
+            .OnDelete(DeleteBehavior.Restrict);
+        
+        // رابطه با ClubMembership
+        builder.HasOne(entity => entity.ClubMembership)
+            .WithMany(cm => cm.UserClubFeatures)
+            .HasForeignKey(entity => entity.ClubMembershipId)
+            .OnDelete(DeleteBehavior.Restrict);
+        
+        // رابطه با ClubFeature
+        builder.HasOne(entity => entity.ClubFeature)
+            .WithMany(cf => cf.UserClubFeatures)
+            .HasForeignKey(entity => entity.ClubFeatureId)
+            .OnDelete(DeleteBehavior.Restrict);
+        
+        // Composite Index برای جلوگیری از تکرار
+        builder.HasIndex(e => new { e.UserId, e.ClubFeatureId })
+            .IsUnique()
+            .HasDatabaseName("IX_UserClubFeature_UserId_ClubFeatureId");
+        
+        // Index برای ClubMembershipId
+        builder.HasIndex(e => e.ClubMembershipId)
+            .HasDatabaseName("IX_UserClubFeature_ClubMembershipId");
+    }
+}