fix: resolve trial subscription cache issue on new user registration

When new users register with trial subscription enabled, the subscription
link fails to connect in Clash clients. This is caused by missing cache
invalidation after transaction commit.

Changes:
- Add cache clearing after successful trial subscription creation
- Clear user subscription cache, subscription details cache, and server cache
- Modify activeTrial functions to return subscription object for cache clearing
- Apply fix to all registration methods: email, phone, device, and OAuth

This ensures subscription links work immediately after registration without
requiring manual subscription reset.

internal/logic/auth/deviceLoginLogic.go

@@ -152,6 +152,7 @@ func (l *DeviceLoginLogic) registerUserAndDevice(req *types.DeviceLoginRequest)
 	)
 
 	var userInfo *user.User
+	var trialSubscribe *user.Subscribe
 	err := l.svcCtx.UserModel.Transaction(l.ctx, func(db *gorm.DB) error {
 		// Create new user
 		userInfo = &user.User{
@@ -212,8 +213,10 @@ func (l *DeviceLoginLogic) registerUserAndDevice(req *types.DeviceLoginRequest)
 
 		// Activate trial if enabled
 		if l.svcCtx.Config.Register.EnableTrial {
-			if err := l.activeTrial(userInfo.Id, db); err != nil {
-				return err
+			var trialErr error
+			trialSubscribe, trialErr = l.activeTrial(userInfo.Id, db)
+			if trialErr != nil {
+				return trialErr
 			}
 		}
 
@@ -228,6 +231,25 @@ func (l *DeviceLoginLogic) registerUserAndDevice(req *types.DeviceLoginRequest)
 		return nil, err
 	}
 
+	// Clear cache after transaction success
+	if l.svcCtx.Config.Register.EnableTrial && trialSubscribe != nil {
+		// Clear user subscription cache
+		if err = l.svcCtx.UserModel.ClearSubscribeCache(l.ctx, trialSubscribe); err != nil {
+			l.Errorw("ClearSubscribeCache failed", logger.Field("error", err.Error()), logger.Field("userSubscribeId", trialSubscribe.Id))
+			// Don't return error, just log it
+		}
+		// Clear subscription cache
+		if err = l.svcCtx.SubscribeModel.ClearCache(l.ctx, trialSubscribe.SubscribeId); err != nil {
+			l.Errorw("ClearSubscribeCache failed", logger.Field("error", err.Error()), logger.Field("subscribeId", trialSubscribe.SubscribeId))
+			// Don't return error, just log it
+		}
+		// Clear all server cache
+		if err = l.svcCtx.NodeModel.ClearServerAllCache(l.ctx); err != nil {
+			l.Errorf("ClearServerAllCache error: %v", err.Error())
+			// Don't return error, just log it
+		}
+	}
+
 	l.Infow("device registration completed successfully",
 		logger.Field("user_id", userInfo.Id),
 		logger.Field("identifier", req.Identifier),
@@ -260,7 +282,7 @@ func (l *DeviceLoginLogic) registerUserAndDevice(req *types.DeviceLoginRequest)
 	return userInfo, nil
 }
 
-func (l *DeviceLoginLogic) activeTrial(userId int64, db *gorm.DB) error {
+func (l *DeviceLoginLogic) activeTrial(userId int64, db *gorm.DB) (*user.Subscribe, error) {
 	sub, err := l.svcCtx.SubscribeModel.FindOne(l.ctx, l.svcCtx.Config.Register.TrialSubscribe)
 	if err != nil {
 		l.Errorw("failed to find trial subscription template",
@@ -268,7 +290,7 @@ func (l *DeviceLoginLogic) activeTrial(userId int64, db *gorm.DB) error {
 			logger.Field("trial_subscribe_id", l.svcCtx.Config.Register.TrialSubscribe),
 			logger.Field("error", err.Error()),
 		)
-		return err
+		return nil, err
 	}
 
 	startTime := time.Now()
@@ -295,7 +317,7 @@ func (l *DeviceLoginLogic) activeTrial(userId int64, db *gorm.DB) error {
 			logger.Field("user_id", userId),
 			logger.Field("error", err.Error()),
 		)
-		return err
+		return nil, err
 	}
 
 	l.Infow("trial subscription activated successfully",
@@ -305,8 +327,5 @@ func (l *DeviceLoginLogic) activeTrial(userId int64, db *gorm.DB) error {
 		logger.Field("traffic", sub.Traffic),
 	)
 
-	if clearErr := l.svcCtx.NodeModel.ClearServerAllCache(l.ctx); clearErr != nil {
-		l.Errorf("ClearServerAllCache error: %v", clearErr.Error())
-	}
-	return nil
+	return userSub, nil
 }