类：VirtualProvider

🌐 Class: VirtualProvider

所有 VFS 提供者的基类。子类实现基本操作（比如 open、stat、readdir、mkdir、rmdir、unlink、rename 等），并继承派生方法的默认实现（比如 readFile、writeFile、exists、copyFile、access 等）。

🌐 The base class for all VFS providers. Subclasses implement the essential primitives (such as open, stat, readdir, mkdir, rmdir, unlink, rename, etc.) and inherit default implementations of the derived methods (such as readFile, writeFile, exists, copyFile, access, etc.).