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.Infrastructure/Persistence/Configurations/UserInvitationConfiguration.cs

@@ -0,0 +1,38 @@
+using CMSMicroservice.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace CMSMicroservice.Infrastructure.Persistence.Configurations;
+
+public class UserInvitationConfiguration : IEntityTypeConfiguration<UserInvitation>
+{
+    public void Configure(EntityTypeBuilder<UserInvitation> builder)
+    {
+        builder.ToTable("UserInvitations");
+        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.InviterUserId).IsRequired();
+        builder.Property(entity => entity.InviteeUserId).IsRequired();
+
+        builder.HasOne(entity => entity.Inviter)
+            .WithMany()
+            .HasForeignKey(entity => entity.InviterUserId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasOne(entity => entity.Invitee)
+            .WithMany()
+            .HasForeignKey(entity => entity.InviteeUserId)
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasIndex(e => e.InviteeUserId)
+            .IsUnique()
+            .HasDatabaseName("IX_UserInvitations_InviteeUserId");
+
+        builder.HasIndex(e => new { e.InviterUserId, e.Created })
+            .HasDatabaseName("IX_UserInvitations_InviterUserId_Created");
+    }
+}