fix(auth): 修复设备登录时旧会话未清理的问题

在设备登录逻辑中添加对旧会话的清理，防止同一设备多会话冲突
同时修复邮箱绑定时的设备数量限制校验问题

internal/logic/auth/deviceLoginLogic.go

@@ -140,9 +140,21 @@ func (l *DeviceLoginLogic) DeviceLogin(req *types.DeviceLoginRequest) (resp *typ
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.ERROR), "token generate error: %v", err.Error())
 	}
 
-    if err = l.svcCtx.EnforceUserSessionLimit(l.ctx, userInfo.Id, sessionId, l.svcCtx.SessionLimit()); err != nil {
-        return nil, errors.Wrapf(xerr.NewErrCode(xerr.ERROR), "enforce session limit error: %v", err.Error())
-    }
+	if err = l.svcCtx.EnforceUserSessionLimit(l.ctx, userInfo.Id, sessionId, l.svcCtx.SessionLimit()); err != nil {
+		return nil, errors.Wrapf(xerr.NewErrCode(xerr.ERROR), "enforce session limit error: %v", err.Error())
+	}
+	// If device had a previous session, invalidate it first
+	oldDeviceCacheKey := fmt.Sprintf("%v:%v", config.DeviceCacheKeyKey, req.Identifier)
+	if oldSid, getErr := l.svcCtx.Redis.Get(l.ctx, oldDeviceCacheKey).Result(); getErr == nil && oldSid != "" {
+		oldSessionKey := fmt.Sprintf("%v:%v", config.SessionIdKey, oldSid)
+		if uidStr, _ := l.svcCtx.Redis.Get(l.ctx, oldSessionKey).Result(); uidStr != "" {
+			_ = l.svcCtx.Redis.Del(l.ctx, oldSessionKey).Err()
+			sessionsKey := fmt.Sprintf("%s%v", config.UserSessionsKeyPrefix, uidStr)
+			_ = l.svcCtx.Redis.ZRem(l.ctx, sessionsKey, oldSid).Err()
+		}
+		_ = l.svcCtx.Redis.Del(l.ctx, oldDeviceCacheKey).Err()
+	}
+
 	// Store session id in redis
 	sessionIdCacheKey := fmt.Sprintf("%v:%v", config.SessionIdKey, sessionId)
 	if err = l.svcCtx.Redis.Set(l.ctx, sessionIdCacheKey, userInfo.Id, time.Duration(l.svcCtx.Config.JwtAuth.AccessExpire)*time.Second).Err(); err != nil {
@@ -164,10 +176,10 @@ func (l *DeviceLoginLogic) DeviceLogin(req *types.DeviceLoginRequest) (resp *typ
 	}
 
 	loginStatus = true
-    return &types.LoginResponse{
-        Token: token,
-        Limit: l.svcCtx.SessionLimit(),
-    }, nil
+	return &types.LoginResponse{
+		Token: token,
+		Limit: l.svcCtx.SessionLimit(),
+	}, nil
 }
 
 func (l *DeviceLoginLogic) registerUserAndDevice(req *types.DeviceLoginRequest) (*user.User, error) {