Replace `pyvenv.cfg`'s `home` key with `base-prefix` and `base-exec-prefix`

Feature or enhancement

Proposal:

The home key in pyvenv.cfg is used to specify the directory where the base Python executable is. During the Path Initialization, this directory, and consecutively its parents, is searched for stdlib landmarks to determine sys.base_prefix and sys.base_exec_prefix. Naturally, this isn't ideal, it would be better if pyvenv.cfg contained these values directly.

Proposed plan:

• Update venv to start setting the base-prefix and base-exec-prefix keys in pyvenv.cfg when creating/updating environments
• In getpath, use the base-prefix and base-exec-prefix keys to set the prefixes
• Deprecate specifying home, in pyvenv.cfg

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

先閱讀 venv 環境的建立與更新邏輯，接著追蹤 getpath 中的 Path Initialization，以了解 pyvenv.cfg 目前如何決定 sys.base_prefix 與 sys.base_exec_prefix。定義新的 base-prefix 與 base-exec-prefix 鍵如何寫入及使用、如何棄用 home，並驗證新建立與已更新的環境。