后端：

完善注册页面

backend/IM_API/Models/ImContext.cs

@@ -27,7 +27,6 @@ public partial class ImContext : DbContext
 
     public virtual DbSet<Group> Groups { get; set; }
 
-    public virtual DbSet<GroupInvite> GroupInvites { get; set; }
 
     public virtual DbSet<GroupMember> GroupMembers { get; set; }
 
@@ -362,53 +361,6 @@ public partial class ImContext : DbContext
                 .HasConstraintName("groups_ibfk_1");
         });
 
-        modelBuilder.Entity<GroupInvite>(entity =>
-        {
-            entity.HasKey(e => e.Id).HasName("PRIMARY");
-
-            entity
-                .ToTable("group_invite")
-                .HasCharSet("utf8mb4")
-                .UseCollation("utf8mb4_general_ci");
-
-            entity.HasIndex(e => e.GroupId, "GroupId");
-
-            entity.HasIndex(e => e.InviteUser, "InviteUser");
-
-            entity.HasIndex(e => e.InvitedUser, "InvitedUser");
-
-            entity.Property(e => e.Id)
-                .HasColumnType("int(11)")
-                .HasColumnName("ID");
-            entity.Property(e => e.Created)
-                .HasComment("创建时间")
-                .HasColumnType("datetime");
-            entity.Property(e => e.GroupId)
-                .HasComment("群聊编号")
-                .HasColumnType("int(11)");
-            entity.Property(e => e.InviteUser)
-                .HasComment("邀请用户")
-                .HasColumnType("int(11)");
-            entity.Property(e => e.InvitedUser)
-                .HasComment("被邀请用户")
-                .HasColumnType("int(11)");
-            entity.Property(e => e.State)
-                .HasComment("当前状态(0:待被邀请人同意\r\n1:被邀请人已同意)")
-                .HasColumnType("tinyint(4)");
-
-            entity.HasOne(d => d.Group).WithMany(p => p.GroupInvites)
-                .HasForeignKey(d => d.GroupId)
-                .OnDelete(DeleteBehavior.ClientSetNull)
-                .HasConstraintName("group_invite_ibfk_2");
-
-            entity.HasOne(d => d.InviteUserNavigation).WithMany(p => p.GroupInviteInviteUserNavigations)
-                .HasForeignKey(d => d.InviteUser)
-                .HasConstraintName("group_invite_ibfk_1");
-
-            entity.HasOne(d => d.InvitedUserNavigation).WithMany(p => p.GroupInviteInvitedUserNavigations)
-                .HasForeignKey(d => d.InvitedUser)
-                .HasConstraintName("group_invite_ibfk_3");
-        });
 
         modelBuilder.Entity<GroupMember>(entity =>
         {