doc: Add ai doc translate tool and add English doc. (#1168)

- add tools/doc_translator.py
- translated docs into English

Signed-off-by: longjin <longjin@DragonOS.org>

docs/locales/en/kernel/filesystem/vfs/index.rst

@@ -0,0 +1,33 @@
+.. note:: AI Translation Notice
+
+   This document was automatically translated by `Qwen/Qwen3-8B` model, for reference only.
+
+   - Source document: kernel/filesystem/vfs/index.rst
+
+   - Translation time: 2025-05-19 01:41:14
+
+   - Translation model: `Qwen/Qwen3-8B`
+
+
+   Please report issues via `Community Channel <https://github.com/DragonOS-Community/DragonOS/issues>`_
+
+VFS Virtual File System
+====================================
+
+In DragonOS, VFS acts as an adapter, hiding the differences between specific file systems and providing a unified file operation interface abstraction to the outside.
+
+VFS is the core of the file system in DragonOS. It provides a set of unified file system interfaces, enabling DragonOS to support various different file systems. The main functions of VFS include:
+
+- Providing a unified file system interface
+- Providing mount and unmount mechanisms for file systems (MountFS)
+- Providing file abstraction (File)
+- Providing file system abstraction (FileSystem)
+- Providing IndexNode abstraction
+- Providing caching and synchronization mechanisms for file systems (not yet implemented)
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Directory
+
+   design
+   api