- Remove global `RootUserEmail` variable
- Modify channel testing and user notification methods to use `GetRootUser()`
- Update user cache and notification service to use more consistent user base type
- Add new channel test notification type
- Implement user notification settings with email and webhook options
- Add new user settings for quota warning threshold and notification preferences
- Create backend API and database support for user notification configuration
- Enhance frontend personal settings with notification configuration UI
- Support custom notification email and webhook URL
- Add service layer for sending user notifications
- Update user and wechat controllers to use sessions for user ID
- Modify ID retrieval to use `session.Get("id")` instead of `c.GetInt("id")`
- Cast session ID to int when creating user object
- 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.
- Updated GetAllUsers function to return total user count along with paginated results, improving data handling in user retrieval.
- Modified GetAllUsers API endpoint to accept page size as a parameter, allowing for dynamic pagination.
- Enhanced UsersTable component to support customizable page sizes and improved pagination logic.
- Added error handling for empty username and password in AddUser component.
- Updated LogsTable component to display pagination information in a user-friendly format.
- Introduced a new function `GetUserUsableGroupsCopy` to return a copy of user usable groups.
- Updated `GetUserUsableGroups` to utilize the new function for better encapsulation.
- Changed variable names from `UserUsableGroups` to `userUsableGroups` for consistency.
- Enhanced `GetUserUsableGroups` logic to ensure it returns a copy of the groups, preventing unintended modifications.
