feature: Support hiding details in file __init__.py

## Description This is the structure of my document directory: ```tree 📁my_package/ ├─📄__init__.py ├─📄my_module1.py └─📄my_module2.py ``` And my *mkdocs.yml*: ```yml plugins: - search: - meta: - tags: - autorefs: resolve_closest: true - gen-files: scripts: - scripts/gen_doc_pages.py - literate-nav: nav_file: summary.md - mkdocstrings: handlers: python: inventories: - https://docs.python.org/3/objects.inv options: show_bases: true show_source: false heading_level: 2 parameter_headings: true show_symbol_type_heading: true show_symbol_type_toc: true members_order: source summary: true docstring_section_style: spacy separate_signature: true show_signature_annotations: true annotations_path: source line_length: 80 overloads_only: true merge_init_into_class: true signature_crossrefs: true filters: ["!^_"] show_root_full_path: false extensions: - griffe_inherited_docstrings: - griffe_pydantic: schema: true - griffe_typingdoc: - griffe_warnings_deprecated: - griffe_modernized_annotations: ``` If my *my_package/\_\_init\_\_.py* is like this: ```py """Some module docstring.""" from .my_module1 import * ``` And if my Markdown file *my_package.md* is like this: ```md ::: my_package ``` Then, on page *my_package*, all the detailed content of the classes and functions in module `my_module1` will be displayed, which obviously overlaps somewhat with the content of page *my_module1*. For example: <img width="1552" height="1874" alt="Image" src="https://github.com/user-attachments/assets/7cc661ca-52db-45fa-a666-c4f45cb98806" /> ## Expected Page *my_package* only displays the content of its own module and does not show content imported from external sources. For the content of sub-modules, only a summary is displayed. For example: <img width="1566" height="1868" alt="Image" src="https://github.com/user-attachments/assets/bc581a6b-7ddb-45f3-ada7-81cc140f5e40" /> Perhaps adding a configuration option for this feature is a good approach. By the way, that label `pkg` only changed the CSS, but essentially it's still label `mod`. If I messed something up, just let me know, thanks!