样式优化，markdown优化

backend/src/models/User.ts

@@ -3,6 +3,7 @@ import { Schema, model, Document } from 'mongoose';
 export interface IUser extends Document {
   email: string;
   passwordHash: string;
+  name?: string;
   createdAt: Date;
   updatedAt: Date;
 }
@@ -10,6 +11,7 @@ export interface IUser extends Document {
 const UserSchema = new Schema<IUser>({
   email: { type: String, required: true, unique: true, index: true },
   passwordHash: { type: String, required: true }
+  , name: { type: String }
 }, { timestamps: true });
 
 export const User = model<IUser>('User', UserSchema);