`@system.file`的所有接口的uri只能接受`internal://app`起始的目录

`@system.file`的所有接口的uri只能接受`internal://app`起始的目录
```cpp
constexpr char URI_PREFIX_DATA[] = "internal://app";
```

refs:
https://developer.harmonyos.com/cn/docs/documentation/doc-references/js-apis-file-storage-0000000000629445

https://github.com/openharmony/ace_engine_lite/blob/ab0fe9e328a93182f24869f258068c8f679c8e66/frameworks/src/core/context/js_app_context.cpp#L311-L329
