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/ClubFeatureConfiguration.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace CMSMicroservice.Infrastructure.Persistence.Configurations;
+
+/// <summary>
+/// فیچرهای باشگاه مشتریان
+/// </summary>
+public class ClubFeatureConfiguration : IEntityTypeConfiguration<ClubFeature>
+{
+    public void Configure(EntityTypeBuilder<ClubFeature> 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.Title).IsRequired().HasMaxLength(200);
+        builder.Property(entity => entity.Description).IsRequired(false).HasMaxLength(1000);
+        builder.Property(entity => entity.IsActive).IsRequired();
+        builder.Property(entity => entity.RequiredPoints).IsRequired(false);
+        builder.Property(entity => entity.SortOrder).IsRequired();
+        
+        // Index برای IsActive و SortOrder
+        builder.HasIndex(e => new { e.IsActive, e.SortOrder })
+            .HasDatabaseName("IX_ClubFeature_IsActive_SortOrder");
+    }
+}