docs: clarify Python module responsibilities

Rewrite the module-level descriptions for all 28 Python files and remove the obsolete integration note from grok_register_ttk.py. Verified on Python 3.9 and Python 3.12.

tests/test_module_compatibility.py

@@ -1,3 +1,5 @@
+"""验证主模块对拆分模块公开函数和运行状态的兼容代理。"""
+
 import unittest
 from unittest.mock import patch