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/container/namespaces/index.rst

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+.. note:: AI Translation Notice
+
+   This document was automatically translated by `Qwen/Qwen3-8B` model, for reference only.
+
+   - Source document: kernel/container/namespaces/index.rst
+
+   - Translation time: 2025-05-19 01:41:19
+
+   - Translation model: `Qwen/Qwen3-8B`
+
+
+   Please report issues via `Community Channel <https://github.com/DragonOS-Community/DragonOS/issues>`_
+
+====================================
+Namespaces
+====================================
+
+DragonOS's namespaces currently support pid_namespace and mnt_namespace, and more features are expected to be added in the future.
+
+Namespaces are an important component in the process of containerization.
+
+Since the current OS is single-user, user_namespace is globally static.
+
+.. toctree::
+   :maxdepth: 1
+
+   pid_namespace
+   mnt_namespace

docs/locales/en/kernel/container/namespaces/mnt_namespace.md

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+:::{note}
+**AI Translation Notice**
+
+This document was automatically translated by `Qwen/Qwen3-8B` model, for reference only.
+
+- Source document: kernel/container/namespaces/mnt_namespace.md
+
+- Translation time: 2025-05-19 01:41:19
+
+- Translation model: `Qwen/Qwen3-8B`
+
+Please report issues via [Community Channel](https://github.com/DragonOS-Community/DragonOS/issues)
+
+:::
+
+# Mount Namespace
+
+## Underlying Architecture
+
+pcb -> nsproxy -> mnt_namespace
+
+Each mounted file system has its own independent mount point, which is represented in the data structure as a red-black tree of mounts. Each namespace has its own independent mounts, so mounting and unmounting file systems will not affect others.
+
+## System Call Interface
+
+- clone
+    - CLONE_NEWNS is used to create a new MNT namespace. It provides an independent file system mount point.
+- unshare
+    - After calling unshare() with the CLONE_NEWPID flag, all subsequent child processes will run in the new namespace.
+- setns
+    - Adds the process to the specified namespace.
+- chroot
+    - Changes the current process's root directory to the specified path, providing file system isolation.

docs/locales/en/kernel/container/namespaces/pid_namespace.md

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+:::{note}
+**AI Translation Notice**
+
+This document was automatically translated by `Qwen/Qwen3-8B` model, for reference only.
+
+- Source document: kernel/container/namespaces/pid_namespace.md
+
+- Translation time: 2025-05-19 01:41:31
+
+- Translation model: `Qwen/Qwen3-8B`
+
+Please report issues via [Community Channel](https://github.com/DragonOS-Community/DragonOS/issues)
+
+:::
+
+# Process Namespace
+:::{note} Author: Cao Fengyi 1553389239@qq.com
+
+October 30, 2024
+:::
+
+`pid_namespace` is a type of namespace in the kernel that is used to achieve process isolation. It allows processes running in different namespaces to have independent views of process IDs (PIDs).
+
+## Underlying Architecture
+
+pcb -> nsproxy -> pid_namespace
+- `pid_namespace` contains an independent set of process allocators and an orphan process reaper, which independently manages PIDs within the namespace.
+- Detailed information about processes is stored in the proc file system. The information corresponding to a specific PID is located within the `pid_namespace`, recording information related to the `pid_namespace`.
+- The limitations imposed by `pid_namespace` are controlled and managed by `ucount`.
+
+## System Call Interface
+
+- `clone`
+    - `CLONE_NEWPID` is used to create a new PID namespace. When this flag is used, the child process will run in the new PID namespace, with the process ID starting from 1.
+- `unshare`
+    - After calling `unshare()` with the `CLONE_NEWPID` flag, all subsequent child processes will run within the new namespace.
+- `getpid`
+    - Calling `getpid()` within a namespace returns the process ID of the process within the current PID namespace.