refactor: 重构资产实体和DTO结构类型

将gjson.Json类型替换为具体的结构体和map类型，修正DAO层链式调用，启用SKU元数据校验逻辑

consts/asset/asset_status.go

@@ -1,9 +1,28 @@
 package consts
 
+import "github.com/gogf/gf/v2/util/gconv"
+
 // AssetStatus 资产状态枚举
 
-type AssetStatusType *int
+var (
+	AssetStatusDisable = newAssetStatus(gconv.PtrInt8(0), "disable")
+	AssetStatusEnable  = newAssetStatus(gconv.PtrInt8(1), "enable")
+)
 
-type AssetStatus struct {
-	Status AssetStatusType
+type AssetStatus *int8
+
+type assetStatus struct {
+	code AssetStatus
+	desc string
+}
+
+func (s assetStatus) Code() AssetStatus {
+	return s.code
+}
+func (s assetStatus) Desc() string {
+	return s.desc
+}
+
+func newAssetStatus(code AssetStatus, desc string) assetStatus {
+	return assetStatus{code: code, desc: desc}
 }