admin: add create-user dialog and API

backend_v1/app/services/users.go

@@ -477,3 +477,53 @@ func (m *users) SetPhone(ctx context.Context, userID int64, phone string) error
 	}
 	return nil
 }
+
+// CreateByPhone 管理端通过手机号创建新用户（手机号必填，昵称可选）。
+func (m *users) CreateByPhone(ctx context.Context, phone, username string) (*models.User, error) {
+	phone = strings.TrimSpace(phone)
+	if phone == "" {
+		return nil, errors.New("手机号不能为空")
+	}
+	if len(phone) != 11 {
+		return nil, errors.New("手机号必须为 11 位数字")
+	}
+	for _, r := range phone {
+		if r < '0' || r > '9' {
+			return nil, errors.New("手机号必须为 11 位数字")
+		}
+	}
+
+	_, err := m.FindByPhone(ctx, phone)
+	if err == nil {
+		return nil, errors.New("手机号已被其他用户占用")
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, errors.Wrap(err, "failed to check phone uniqueness")
+	}
+
+	openID := "phone:" + phone
+	tbl, query := models.UserQuery.QueryContext(ctx)
+	if _, err := query.Where(tbl.OpenID.Eq(openID)).First(); err == nil {
+		return nil, errors.New("用户已存在")
+	} else if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, errors.Wrap(err, "failed to check open_id uniqueness")
+	}
+
+	username = strings.TrimSpace(username)
+	if username == "" {
+		username = "用户" + phone[len(phone)-4:]
+	}
+
+	user := &models.User{
+		OpenID:   openID,
+		Username: username,
+		Phone:    phone,
+		Balance:  0,
+		Avatar:   "",
+	}
+
+	if err := _db.WithContext(ctx).Omit("metas", "auth_token").Create(user).Error; err != nil {
+		return nil, errors.Wrap(err, "failed to create user")
+	}
+	return user, nil
+}