新增客户端管理功能，包括创建、编辑和删除客户端的API，更新用户管理功能，添加用户创建和编辑页面，优化管理员功能，增强用户和客户端的管理体验。

services/admin.go

@@ -177,3 +177,72 @@ func (s *AdminService) ListClients(page, pageSize int) ([]models.Client, int64,
 	err := s.db.Offset((page - 1) * pageSize).Limit(pageSize).Find(&clients).Error
 	return clients, total, err
 }
+
+// CreateUser 创建新用户
+func (s *AdminService) CreateUser(username, password, email string) (*models.User, error) {
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return nil, err
+	}
+
+	user := &models.User{
+		Username: username,
+		Password: string(hashedPassword),
+		Email:    email,
+		IsActive: true,
+	}
+
+	if err := s.db.Create(user).Error; err != nil {
+		return nil, err
+	}
+
+	return user, nil
+}
+
+// UpdateUser 更新用户信息
+func (s *AdminService) UpdateUser(id uint, username, email string, isActive *bool) (*models.User, error) {
+	user := &models.User{}
+	if err := s.db.First(user, id).Error; err != nil {
+		return nil, err
+	}
+
+	if username != "" {
+		user.Username = username
+	}
+	if email != "" {
+		user.Email = email
+	}
+	if isActive != nil {
+		user.IsActive = *isActive
+	}
+
+	if err := s.db.Save(user).Error; err != nil {
+		return nil, err
+	}
+
+	return user, nil
+}
+
+// UpdateUserPassword 更新用户密码
+func (s *AdminService) UpdateUserPassword(id uint, password string) error {
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+
+	return s.db.Model(&models.User{}).Where("id = ?", id).Update("password", string(hashedPassword)).Error
+}
+
+// DeleteUser 删除用户
+func (s *AdminService) DeleteUser(id uint) error {
+	return s.db.Delete(&models.User{}, id).Error
+}
+
+// GetUser 获取单个用户信息
+func (s *AdminService) GetUser(id uint) (*models.User, error) {
+	user := &models.User{}
+	if err := s.db.First(user, id).Error; err != nil {
+		return nil, err
+	}
+	return user, nil
+}