feat: enhance user search functionality with pagination support

- Updated SearchUsers function to include pagination parameters (startIdx and num) for improved user search results.
- Modified API response structure to return paginated data, including total user count and current page information.
- Adjusted UsersTable component to handle pagination and search parameters, ensuring a seamless user experience.
- Added internationalization support for new search functionality in the UI.

model/user.go

@@ -115,36 +115,66 @@ func GetAllUsers(startIdx int, num int) (users []*User, total int64, err error)
 	return users, total, nil
 }
 
-func SearchUsers(keyword string, group string) ([]*User, error) {
+func SearchUsers(keyword string, group string, startIdx int, num int) ([]*User, int64, error) {
 	var users []*User
+	var total int64
 	var err error
 
+	// 开始事务
+	tx := DB.Begin()
+	if tx.Error != nil {
+		return nil, 0, tx.Error
+	}
+	defer func() {
+		if r := recover(); r != nil {
+			tx.Rollback()
+		}
+	}()
+
+	// 构建基础查询
+	query := tx.Unscoped().Model(&User{})
+
 	// 尝试将关键字转换为整数ID
 	keywordInt, err := strconv.Atoi(keyword)
 	if err == nil {
 		// 如果转换成功，按照ID和可选的组别搜索用户
-		query := DB.Unscoped().Omit("password").Where("id = ?", keywordInt)
 		if group != "" {
-			query = query.Where(groupCol+" = ?", group) // 使用反引号包围group
+			query = query.Where("id = ? AND "+groupCol+" = ?", keywordInt, group)
+		} else {
+			query = query.Where("id = ?", keywordInt)
 		}
-		err = query.Find(&users).Error
-		if err != nil || len(users) > 0 {
-			return users, err
-		}
-	}
-
-	err = nil
-
-	query := DB.Unscoped().Omit("password")
-	likeCondition := "username LIKE ? OR email LIKE ? OR display_name LIKE ?"
-	if group != "" {
-		query = query.Where("("+likeCondition+") AND "+groupCol+" = ?", "%"+keyword+"%", "%"+keyword+"%", "%"+keyword+"%", group)
 	} else {
-		query = query.Where(likeCondition, "%"+keyword+"%", "%"+keyword+"%", "%"+keyword+"%")
+		// 如果不是ID搜索，则使用模糊匹配
+		likeCondition := "username LIKE ? OR email LIKE ? OR display_name LIKE ?"
+		if group != "" {
+			query = query.Where("("+likeCondition+") AND "+groupCol+" = ?",
+				"%"+keyword+"%", "%"+keyword+"%", "%"+keyword+"%", group)
+		} else {
+			query = query.Where(likeCondition,
+				"%"+keyword+"%", "%"+keyword+"%", "%"+keyword+"%")
+		}
 	}
-	err = query.Find(&users).Error
 
-	return users, err
+	// 获取总数
+	err = query.Count(&total).Error
+	if err != nil {
+		tx.Rollback()
+		return nil, 0, err
+	}
+
+	// 获取分页数据
+	err = query.Omit("password").Order("id desc").Limit(num).Offset(startIdx).Find(&users).Error
+	if err != nil {
+		tx.Rollback()
+		return nil, 0, err
+	}
+
+	// 提交事务
+	if err = tx.Commit().Error; err != nil {
+		return nil, 0, err
+	}
+
+	return users, total, nil
 }
 
 func GetUserById(id int, selectAll bool) (*User, error) {