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/Queries/GetClubMembership/ClubMembershipDto.cs

@@ -0,0 +1,16 @@
+namespace CMSMicroservice.Application.ClubMembershipCQ.Queries.GetClubMembership;
+
+/// <summary>
+/// DTO برای نمایش اطلاعات عضویت باشگاه
+/// </summary>
+public class ClubMembershipDto
+{
+    public long Id { get; set; }
+    public long UserId { get; set; }
+    public bool IsActive { get; set; }
+    public DateTime? ActivatedAt { get; set; }
+    public long InitialContribution { get; set; }
+    public long TotalEarned { get; set; }
+    public DateTimeOffset Created { get; set; }
+    public DateTimeOffset? LastModified { get; set; }
+}

src/CMSMicroservice.Application/ClubMembershipCQ/Queries/GetClubMembership/GetClubMembershipQuery.cs

@@ -0,0 +1,12 @@
+namespace CMSMicroservice.Application.ClubMembershipCQ.Queries.GetClubMembership;
+
+/// <summary>
+/// Query برای دریافت عضویت باشگاه یک کاربر
+/// </summary>
+public record GetClubMembershipQuery : IRequest<ClubMembershipDto?>
+{
+    /// <summary>
+    /// شناسه کاربر
+    /// </summary>
+    public long UserId { get; init; }
+}

src/CMSMicroservice.Application/ClubMembershipCQ/Queries/GetClubMembership/GetClubMembershipQueryHandler.cs

@@ -0,0 +1,32 @@
+namespace CMSMicroservice.Application.ClubMembershipCQ.Queries.GetClubMembership;
+
+public class GetClubMembershipQueryHandler : IRequestHandler<GetClubMembershipQuery, ClubMembershipDto?>
+{
+    private readonly IApplicationDbContext _context;
+
+    public GetClubMembershipQueryHandler(IApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<ClubMembershipDto?> Handle(GetClubMembershipQuery request, CancellationToken cancellationToken)
+    {
+        var membership = await _context.ClubMemberships
+            .AsNoTracking()
+            .Where(x => x.UserId == request.UserId)
+            .Select(x => new ClubMembershipDto
+            {
+                Id = x.Id,
+                UserId = x.UserId,
+                IsActive = x.IsActive,
+                ActivatedAt = x.ActivatedAt,
+                InitialContribution = x.InitialContribution,
+                TotalEarned = x.TotalEarned,
+                Created = x.Created,
+                LastModified = x.LastModified
+            })
+            .FirstOrDefaultAsync(cancellationToken);
+
+        return membership;
+    }
+}

src/CMSMicroservice.Application/ClubMembershipCQ/Queries/GetClubMembership/GetClubMembershipQueryValidator.cs

@@ -0,0 +1,24 @@
+namespace CMSMicroservice.Application.ClubMembershipCQ.Queries.GetClubMembership;
+
+public class GetClubMembershipQueryValidator : AbstractValidator<GetClubMembershipQuery>
+{
+    public GetClubMembershipQueryValidator()
+    {
+        RuleFor(x => x.UserId)
+            .GreaterThan(0)
+            .WithMessage("شناسه کاربر معتبر نیست");
+    }
+
+    public Func<object, string, Task<IEnumerable<string>>> ValidateValue => async (model, propertyName) =>
+    {
+        var result = await ValidateAsync(
+            ValidationContext<GetClubMembershipQuery>.CreateWithOptions(
+                (GetClubMembershipQuery)model, 
+                x => x.IncludeProperties(propertyName)));
+        
+        if (result.IsValid)
+            return Array.Empty<string>();
+        
+        return result.Errors.Select(e => e.ErrorMessage);
+    };
+}