docs: Enable Ruff formatting of Python code blocks in Markdown

[vdusek]

What & why

Ruff 0.16 formats Python code blocks embedded in Markdown files, and does so by default. In this repo the feature was inert twice over: the Ruff pin was ~=0.14.0, which has no Markdown support at all, and [tool.ruff] include was an allowlist of *.py globs, so no Markdown file would have reached the formatter anyway.

This bumps Ruff to ~=0.16.0 and adds **/*.md and **/*.mdx to include, together with the extension = { mdx = "markdown" } mapping that MDX needs (without it Ruff would try to parse .mdx as Python and fail). There is no Markdown in this repo containing Python code blocks today, so no file content changes - this is here to keep the four Apify Python repos configured identically.

Ruff 0.16 flags CPY001 (missing copyright notice) under select = ["ALL"], so it is added to the ignore list, matching apify-sdk-python, apify-client-python and crawlee-python.

No changes to the lint / format Poe tasks are needed. lint already runs ruff format --check and format already runs ruff format, so both pick Markdown up automatically. Note that ruff check (lint rules) does not support Markdown yet, so only formatting is enforced there.

Notes

• The second commit collapses the include allowlist to a single **/*.py glob. This is a pure simplification: no tracked .py file lives outside src/ and tests/, and Ruff processes exactly the same 8 files before and after.

✍️ Drafted by Claude Code