fix: 注销后 device login 补回被删除的 device auth_method，修复前端按钮显示异常

Co-Authored-By: claude-flow <ruv@ruv.net>

internal/logic/auth/deviceLoginLogic.go

@@ -96,6 +96,33 @@ func (l *DeviceLoginLogic) DeviceLogin(req *types.DeviceLoginRequest) (resp *typ
 			)
 			return nil, errors.Wrapf(xerr.NewErrCode(xerr.DatabaseQueryError), "query user failed: %v", err.Error())
 		}
+
+		// 注销后 device auth_method 被删除，重新登录时需要补回
+		hasDeviceAuth := false
+		for _, am := range userInfo.AuthMethods {
+			if am.AuthType == "device" && am.AuthIdentifier == req.Identifier {
+				hasDeviceAuth = true
+				break
+			}
+		}
+		if !hasDeviceAuth {
+			authMethod := &user.AuthMethods{
+				UserId:         userInfo.Id,
+				AuthType:       "device",
+				AuthIdentifier: req.Identifier,
+				Verified:       true,
+			}
+			if createErr := l.svcCtx.DB.Create(authMethod).Error; createErr != nil {
+				l.Errorw("re-create device auth method failed",
+					logger.Field("user_id", userInfo.Id),
+					logger.Field("identifier", req.Identifier),
+					logger.Field("error", createErr.Error()),
+				)
+			} else {
+				// 清缓存让后续 FindOne 返回最新 AuthMethods
+				_ = l.svcCtx.UserModel.ClearUserCache(l.ctx, userInfo)
+			}
+		}
 	}
 
 	// Generate session id