# R2-02 — spec_parser.go: ValueList 查询方法

## 缺失方法

在 `MIoTSpecValueList` 上添加 5 个查询方法：

### Names / Values / Descriptions
```python
@property
def names(self) -> list[str]:
    return [item.name for item in self.items]
@property
def values(self) -> list[Any]:
    return [item.value for item in self.items]
@property
def descriptions(self) -> list[str]:
    return [item.description for item in self.items]
```

### 双向查找
```python
def get_value_by_description(self, description: str) -> Any:
    for item in self.items:
        if item.description == description:
            return item.value
    return None

def get_description_by_value(self, value: Any) -> Optional[str]:
    for item in self.items:
        if item.value == value:
            return item.description
    return None
```

## 目标文件

`D:\miot\go-miot\spec_parser.go`

在 `MIoTSpecValueList` 上添加：
- `func (vl *MIoTSpecValueList) Names() []string`
- `func (vl *MIoTSpecValueList) Values() []interface{}`
- `func (vl *MIoTSpecValueList) Descriptions() []string`
- `func (vl *MIoTSpecValueList) GetValueByDescription(desc string) interface{}`
- `func (vl *MIoTSpecValueList) GetDescriptionByValue(value interface{}) string`