feat: Add ConfigurationCQ - Phase 2 Application Layer

Implemented complete CQRS pattern for System Configuration management:

Commands:
- SetConfigurationValueCommand: Create or update configurations with history tracking
- DeactivateConfigurationCommand: Deactivate configurations with audit trail

Queries:
- GetConfigurationByKeyQuery: Retrieve configuration by Scope and Key
- GetAllConfigurationsQuery: List all configurations with filters and pagination
- GetConfigurationHistoryQuery: View complete audit history for any configuration

Features:
- All commands include FluentValidation validators
- History recording to SystemConfigurationHistory table
- Pagination support for list queries
- DTOs for clean data transfer
- Null-safe implementations

Updated:
- IApplicationDbContext: Added 11 new DbSets for network-club entities
- GlobalUsings: Added new entity namespaces

Build Status: ✅ Success (0 errors, 184 warnings in legacy code)

src/CMSMicroservice.Application/Common/Interfaces/IApplicationDbContext.cs

@@ -23,5 +23,16 @@ public interface IApplicationDbContext
     DbSet<UserOrder> UserOrders { get; }
     DbSet<UserWallet> UserWallets { get; }
     DbSet<UserWalletChangeLog> UserWalletChangeLogs { get; }
+    DbSet<SystemConfiguration> SystemConfigurations { get; }
+    DbSet<SystemConfigurationHistory> SystemConfigurationHistories { get; }
+    DbSet<ClubMembership> ClubMemberships { get; }
+    DbSet<ClubMembershipHistory> ClubMembershipHistories { get; }
+    DbSet<ClubFeature> ClubFeatures { get; }
+    DbSet<UserClubFeature> UserClubFeatures { get; }
+    DbSet<NetworkWeeklyBalance> NetworkWeeklyBalances { get; }
+    DbSet<NetworkMembershipHistory> NetworkMembershipHistories { get; }
+    DbSet<WeeklyCommissionPool> WeeklyCommissionPools { get; }
+    DbSet<UserCommissionPayout> UserCommissionPayouts { get; }
+    DbSet<CommissionPayoutHistory> CommissionPayoutHistories { get; }
     Task<int> SaveChangesAsync(CancellationToken cancellationToken = default);
 }