fix: 修复管理员更新用户信息时意外覆盖字段的问题

- Enable/IsAdmin/OnlyFirstPurchase 改为 *bool，未传时不更新
- Avatar/Remark/ReferCode/ReferralPercentage 加空值保护
- getDeviceList: 恢复 hifastday@hifast.com 家庭成员受限逻辑

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/types/types.go

@@ -3104,13 +3104,13 @@ type UpdateUserBasiceInfoRequest struct {
 	Balance            int64  `json:"balance"`
 	Commission         int64  `json:"commission"`
 	ReferralPercentage uint8  `json:"referral_percentage"`
-	OnlyFirstPurchase  bool   `json:"only_first_purchase"`
+	OnlyFirstPurchase  *bool  `json:"only_first_purchase"`
 	GiftAmount         int64  `json:"gift_amount"`
 	Telegram           int64  `json:"telegram"`
 	ReferCode          string `json:"refer_code"`
 	RefererId          int64  `json:"referer_id"`
-	Enable             bool   `json:"enable"`
-	IsAdmin            bool   `json:"is_admin"`
+	Enable             *bool  `json:"enable"`
+	IsAdmin            *bool  `json:"is_admin"`
 	Remark             string `json:"remark"`
 }