refactor: Simplify root user notification and remove global email variable

- 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

service/channel.go

@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"net/http"
 	"one-api/common"
-	relaymodel "one-api/dto"
+	"one-api/dto"
 	"one-api/model"
 	"one-api/setting"
 	"strings"
@@ -15,17 +15,17 @@ func DisableChannel(channelId int, channelName string, reason string) {
 	model.UpdateChannelStatusById(channelId, common.ChannelStatusAutoDisabled, reason)
 	subject := fmt.Sprintf("通道「%s」（#%d）已被禁用", channelName, channelId)
 	content := fmt.Sprintf("通道「%s」（#%d）已被禁用，原因：%s", channelName, channelId, reason)
-	notifyRootUser(subject, content)
+	NotifyRootUser(subject, content, dto.NotifyTypeChannelUpdate)
 }
 
 func EnableChannel(channelId int, channelName string) {
 	model.UpdateChannelStatusById(channelId, common.ChannelStatusEnabled, "")
 	subject := fmt.Sprintf("通道「%s」（#%d）已被启用", channelName, channelId)
 	content := fmt.Sprintf("通道「%s」（#%d）已被启用", channelName, channelId)
-	notifyRootUser(subject, content)
+	NotifyRootUser(subject, content, dto.NotifyTypeChannelUpdate)
 }
 
-func ShouldDisableChannel(channelType int, err *relaymodel.OpenAIErrorWithStatusCode) bool {
+func ShouldDisableChannel(channelType int, err *dto.OpenAIErrorWithStatusCode) bool {
 	if !common.AutomaticDisableChannelEnabled {
 		return false
 	}
@@ -75,7 +75,7 @@ func ShouldDisableChannel(channelType int, err *relaymodel.OpenAIErrorWithStatus
 	return false
 }
 
-func ShouldEnableChannel(err error, openaiWithStatusErr *relaymodel.OpenAIErrorWithStatusCode, status int) bool {
+func ShouldEnableChannel(err error, openaiWithStatusErr *dto.OpenAIErrorWithStatusCode, status int) bool {
 	if !common.AutomaticEnableChannelEnabled {
 		return false
 	}

service/user_notify.go

@@ -9,17 +9,12 @@ import (
 	"strings"
 )
 
-func notifyRootUser(subject string, content string) {
-	if common.RootUserEmail == "" {
-		common.RootUserEmail = model.GetRootUserEmail()
-	}
-	err := common.SendEmail(subject, common.RootUserEmail, content)
-	if err != nil {
-		common.SysError(fmt.Sprintf("failed to send email: %s", err.Error()))
-	}
+func NotifyRootUser(t string, subject string, content string) {
+	user := model.GetRootUser().ToBaseUser()
+	_ = NotifyUser(&user, dto.NewNotify(t, subject, content, nil))
 }
 
-func NotifyUser(user *model.UserCache, data dto.Notify) error {
+func NotifyUser(user *model.UserBase, data dto.Notify) error {
 	userSetting := user.GetSetting()
 	notifyType, ok := userSetting[constant.UserSettingNotifyType]
 	if !ok {