feat: Add ClubMembershipCQ - Phase 3 Application Layer

- Implemented 3 Commands with handlers and validators:
  * ActivateClubMembership: Create/reactivate membership
  * DeactivateClubMembership: Deactivate existing membership
  * AssignClubFeature: Assign features to club members

- Implemented 3 Queries with handlers, validators, and DTOs:
  * GetClubMembership: Retrieve single membership by UserId
  * GetAllClubMemberships: List with filtering and pagination
  * GetClubMembershipHistory: Audit trail with full history

- All operations include history tracking via ClubMembershipHistory
- Property names aligned with Domain entity definitions
- 21 new files, ~600 lines of code
- Build successful with 0 errors

src/CMSMicroservice.Application/ClubMembershipCQ/Commands/ActivateClubMembership/ActivateClubMembershipCommand.cs

@@ -0,0 +1,22 @@
+namespace CMSMicroservice.Application.ClubMembershipCQ.Commands.ActivateClubMembership;
+
+/// <summary>
+/// Command برای فعال‌سازی عضویت باشگاه مشتریان یک کاربر
+/// </summary>
+public record ActivateClubMembershipCommand : IRequest<long>
+{
+    /// <summary>
+    /// شناسه کاربر
+    /// </summary>
+    public long UserId { get; init; }
+
+    /// <summary>
+    /// تاریخ فعال‌سازی (اختیاری - پیش‌فرض: الان)
+    /// </summary>
+    public DateTimeOffset? ActivationDate { get; init; }
+
+    /// <summary>
+    /// دلیل فعال‌سازی (برای History)
+    /// </summary>
+    public string? Reason { get; init; }
+}

src/CMSMicroservice.Application/ClubMembershipCQ/Commands/ActivateClubMembership/ActivateClubMembershipCommandHandler.cs

@@ -0,0 +1,84 @@
+namespace CMSMicroservice.Application.ClubMembershipCQ.Commands.ActivateClubMembership;
+
+public class ActivateClubMembershipCommandHandler : IRequestHandler<ActivateClubMembershipCommand, long>
+{
+    private readonly IApplicationDbContext _context;
+
+    public ActivateClubMembershipCommandHandler(IApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<long> Handle(ActivateClubMembershipCommand request, CancellationToken cancellationToken)
+    {
+        // بررسی وجود کاربر
+        var userExists = await _context.Users
+            .AnyAsync(x => x.Id == request.UserId, cancellationToken);
+
+        if (!userExists)
+        {
+            throw new NotFoundException(nameof(User), request.UserId);
+        }
+
+        // بررسی عضویت فعلی
+        var existingMembership = await _context.ClubMemberships
+            .FirstOrDefaultAsync(x => x.UserId == request.UserId, cancellationToken);
+
+        ClubMembership entity;
+        bool isNewMembership = existingMembership == null;
+        var activationDate = request.ActivationDate ?? DateTimeOffset.UtcNow;
+
+        if (isNewMembership)
+        {
+            // ایجاد عضویت جدید
+            entity = new ClubMembership
+            {
+                UserId = request.UserId,
+                IsActive = true,
+                ActivatedAt = activationDate.DateTime,
+                InitialContribution = 0,
+                TotalEarned = 0
+            };
+
+            await _context.ClubMemberships.AddAsync(entity, cancellationToken);
+        }
+        else
+        {
+            // فعال‌سازی مجدد عضویت موجود
+            entity = existingMembership;
+
+            if (entity.IsActive)
+            {
+                // اگر از قبل فعال است، فقط تاریخ را به‌روز می‌کنیم
+                entity.ActivatedAt = activationDate.DateTime;
+            }
+            else
+            {
+                // فعال‌سازی عضویت غیرفعال
+                entity.IsActive = true;
+                entity.ActivatedAt = activationDate.DateTime;
+            }
+
+            _context.ClubMemberships.Update(entity);
+        }
+
+        await _context.SaveChangesAsync(cancellationToken);
+
+        // ثبت تاریخچه
+        var history = new ClubMembershipHistory
+        {
+            ClubMembershipId = entity.Id,
+            UserId = entity.UserId,
+            OldIsActive = !isNewMembership && !existingMembership!.IsActive,
+            NewIsActive = true,
+            Action = ClubMembershipAction.Activated,
+            Reason = request.Reason ?? (isNewMembership ? "Initial activation" : "Reactivated"),
+            PerformedBy = "System" // TODO: باید از Current User گرفته شود
+        };
+
+        await _context.ClubMembershipHistories.AddAsync(history, cancellationToken);
+        await _context.SaveChangesAsync(cancellationToken);
+
+        return entity.Id;
+    }
+}

src/CMSMicroservice.Application/ClubMembershipCQ/Commands/ActivateClubMembership/ActivateClubMembershipCommandValidator.cs

@@ -0,0 +1,34 @@
+namespace CMSMicroservice.Application.ClubMembershipCQ.Commands.ActivateClubMembership;
+
+public class ActivateClubMembershipCommandValidator : AbstractValidator<ActivateClubMembershipCommand>
+{
+    public ActivateClubMembershipCommandValidator()
+    {
+        RuleFor(x => x.UserId)
+            .GreaterThan(0)
+            .WithMessage("شناسه کاربر معتبر نیست");
+
+        RuleFor(x => x.ActivationDate)
+            .LessThanOrEqualTo(DateTimeOffset.UtcNow.AddDays(1))
+            .WithMessage("تاریخ فعال‌سازی نمی‌تواند در آینده باشد")
+            .When(x => x.ActivationDate.HasValue);
+
+        RuleFor(x => x.Reason)
+            .MaximumLength(500)
+            .WithMessage("دلیل فعال‌سازی نمی‌تواند بیشتر از 500 کاراکتر باشد")
+            .When(x => !string.IsNullOrEmpty(x.Reason));
+    }
+
+    public Func<object, string, Task<IEnumerable<string>>> ValidateValue => async (model, propertyName) =>
+    {
+        var result = await ValidateAsync(
+            ValidationContext<ActivateClubMembershipCommand>.CreateWithOptions(
+                (ActivateClubMembershipCommand)model, 
+                x => x.IncludeProperties(propertyName)));
+        
+        if (result.IsValid)
+            return Array.Empty<string>();
+        
+        return result.Errors.Select(e => e.ErrorMessage);
+    };
+}