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/oauth/oAuthLoginGetTokenLogic.go

@@ -341,6 +341,7 @@ func (l *OAuthLoginGetTokenLogic) register(email, avatar, method, openid, reques
 	}
 
 	var userInfo *user.User
+	var trialSubscribe *user.Subscribe
 	err := l.svcCtx.UserModel.Transaction(l.ctx, func(db *gorm.DB) error {
 		if email != "" {
 			l.Debugw("checking if email already exists",
@@ -397,8 +398,10 @@ func (l *OAuthLoginGetTokenLogic) register(email, avatar, method, openid, reques
 				logger.Field("request_id", requestID),
 				logger.Field("user_id", userInfo.Id),
 			)
-			if err := l.activeTrial(userInfo.Id, requestID); err != nil {
-				return err
+			var trialErr error
+			trialSubscribe, trialErr = l.activeTrial(userInfo.Id, requestID)
+			if trialErr != nil {
+				return trialErr
 			}
 		}
 
@@ -415,6 +418,25 @@ func (l *OAuthLoginGetTokenLogic) register(email, avatar, method, openid, reques
 		return userInfo, 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("user registration completed successfully",
 		logger.Field("request_id", requestID),
 		logger.Field("user_id", userInfo.Id),
@@ -793,7 +815,7 @@ func (l *OAuthLoginGetTokenLogic) findOrRegisterUser(authType, openID, email, av
 	return userInfo, nil
 }
 
-func (l *OAuthLoginGetTokenLogic) activeTrial(uid int64, requestID string) error {
+func (l *OAuthLoginGetTokenLogic) activeTrial(uid int64, requestID string) (*user.Subscribe, error) {
 	l.Debugw("fetching trial subscription template",
 		logger.Field("request_id", requestID),
 		logger.Field("user_id", uid),
@@ -808,7 +830,7 @@ func (l *OAuthLoginGetTokenLogic) activeTrial(uid int64, requestID string) error
 			logger.Field("trial_subscribe_id", l.svcCtx.Config.Register.TrialSubscribe),
 			logger.Field("error", err.Error()),
 		)
-		return err
+		return nil, err
 	}
 
 	startTime := time.Now()
@@ -848,7 +870,7 @@ func (l *OAuthLoginGetTokenLogic) activeTrial(uid int64, requestID string) error
 			logger.Field("user_id", uid),
 			logger.Field("error", err.Error()),
 		)
-		return err
+		return nil, err
 	}
 
 	l.Infow("trial subscription activated successfully",
@@ -858,5 +880,5 @@ func (l *OAuthLoginGetTokenLogic) activeTrial(uid int64, requestID string) error
 		logger.Field("expire_time", expireTime),
 		logger.Field("traffic", sub.Traffic),
 	)
-	return nil
+	return userSub, nil
 }