feat(user): add user invitation functionality and enhance OTP verification

- Introduced UserInvitation entity and updated IApplicationDbContext to include UserInvitations DbSet.
- Enhanced VerifyOtpTokenCommand and its handler to support optional inviter mobile number for user registration.
- Added new Protobuf definitions for GetMyInvitees and GetInvitationsByFilter RPCs to manage user invitations.
- Updated UserService to implement methods for retrieving invitees and invitations based on filters.
- Bumped Protobuf project version to reflect the addition of new features.

src/CMSMicroservice.Application/UserCQ/Commands/VerifyOtpToken/VerifyOtpTokenCommand.cs

@@ -9,5 +9,7 @@ public record VerifyOtpTokenCommand : IRequest<VerifyOtpTokenResponseDto>
     public string Code { get; init; }
     //کد معرف والد 
     public string? ParentReferralCode { get; init; }
+    //شماره موبایل دعوت‌کننده (اختیاری)
+    public string? InviterMobile { get; init; }
 
 }

src/CMSMicroservice.Application/UserCQ/Commands/VerifyOtpToken/VerifyOtpTokenCommandHandler.cs

@@ -118,6 +118,34 @@ public class VerifyOtpTokenCommandHandler : IRequestHandler<VerifyOtpTokenComman
             else
                 return new VerifyOtpTokenResponseDto { Success = false, Message = "ظرفیت معرف تکمیل است!!" };
 
+            // ── دعوت‌کننده (اختیاری؛ اعتبارسنجی سخت قبل از ایجاد کاربر) ──
+            User? inviter = null;
+            if (!string.IsNullOrWhiteSpace(request.InviterMobile))
+            {
+                var inviterMobile = request.InviterMobile.NormalizeIranMobile();
+                if (inviterMobile == mobile)
+                {
+                    return new VerifyOtpTokenResponseDto
+                    {
+                        Success = false,
+                        Message = "شماره موبایل دعوت‌کننده نمی‌تواند با شماره خودتان یکسان باشد."
+                    };
+                }
+
+                inviter = await _context.Users
+                    .AsNoTracking()
+                    .FirstOrDefaultAsync(u => u.Mobile == inviterMobile, cancellationToken);
+
+                if (inviter == null)
+                {
+                    return new VerifyOtpTokenResponseDto
+                    {
+                        Success = false,
+                        Message = "دعوت‌کننده با این شماره موبایل یافت نشد."
+                    };
+                }
+            }
+
             // ایجاد کاربر جدید
             user = new User
             {
@@ -134,6 +162,15 @@ public class VerifyOtpTokenCommandHandler : IRequestHandler<VerifyOtpTokenComman
             user.AddDomainEvent(new CreateNewUserEvent(user));
             await _context.SaveChangesAsync(cancellationToken);
 
+            if (inviter != null)
+            {
+                await _context.UserInvitations.AddAsync(new UserInvitation
+                {
+                    InviterUserId = inviter.Id,
+                    InviteeUserId = user.Id
+                }, cancellationToken);
+            }
+
             // ایجاد نقش کاربری
             var userRole = new UserRole { UserId = user.Id, RoleId = 1 };
             await _context.UserRoles.AddAsync(userRole, cancellationToken);