fix: fix find_python when using venv

[killcerr]

issue

reproduce

python -m venv .
pip install endstone
endstone

log

[2024-12-28 00:44:59.642 ERROR] [Server] Error occurred when trying to register a plugin loader: RuntimeError: Unable to find Python executable. Attempted paths: ['C:\\Users\\killcerr\\endstone\\python.exe']

At:
  C:\Users\killcerr\endstone\Lib\site-packages\endstone\_internal\plugin_loader.py(40): find_python
  C:\Users\killcerr\endstone\Lib\site-packages\endstone\_internal\plugin_loader.py(52): __init__

fix

add sys.executable to path search list.

related issue

#28