前端：

1、完善创建群聊逻辑
后端：
1、完善群聊相关接口

backend/IM_API/Migrations/20260211065853_update-group-groupid-userid.cs

@@ -0,0 +1,49 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace IM_API.Migrations
+{
+    /// <inheritdoc />
+    public partial class updategroupgroupiduserid : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "group_request_ibfk_2",
+                table: "group_request");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_group_request_UserId",
+                table: "group_request",
+                column: "UserId");
+
+            migrationBuilder.AddForeignKey(
+                name: "group_request_ibfk_2",
+                table: "group_request",
+                column: "UserId",
+                principalTable: "users",
+                principalColumn: "ID");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "group_request_ibfk_2",
+                table: "group_request");
+
+            migrationBuilder.DropIndex(
+                name: "IX_group_request_UserId",
+                table: "group_request");
+
+            migrationBuilder.AddForeignKey(
+                name: "group_request_ibfk_2",
+                table: "group_request",
+                column: "GroupId",
+                principalTable: "users",
+                principalColumn: "ID");
+        }
+    }
+}

backend/IM_API/Migrations/ImContextModelSnapshot.cs

@@ -513,6 +513,8 @@ namespace IM_API.Migrations
                     b.HasKey("Id")
                         .HasName("PRIMARY");
 
+                    b.HasIndex("UserId");
+
                     b.HasIndex(new[] { "GroupId" }, "GroupId")
                         .HasDatabaseName("GroupId1");
 
@@ -985,15 +987,15 @@ namespace IM_API.Migrations
                         .IsRequired()
                         .HasConstraintName("group_request_ibfk_1");
 
-                    b.HasOne("IM_API.Models.User", "GroupNavigation")
+                    b.HasOne("IM_API.Models.User", "User")
                         .WithMany("GroupRequests")
-                        .HasForeignKey("GroupId")
+                        .HasForeignKey("UserId")
                         .IsRequired()
                         .HasConstraintName("group_request_ibfk_2");
 
                     b.Navigation("Group");
 
-                    b.Navigation("GroupNavigation");
+                    b.Navigation("User");
                 });
 
             modelBuilder.Entity("IM_API.Models.LoginLog", b =>