Fix public media info web fallback

[subzeroid]

Summary

• mirror instagrapi 2.17.1 public media info fallback for async clients
• post current media info doc_id to /api/graphql with LSD web headers and normalize xdt_api__v1__media__shortcode__web_info.items
• tolerate media payloads where video_versions is present but null, including sidecar children
• bump aiograpi to 1.11.1 and sync upstream baseline to instagrapi 2.17.1

Tests

• PYTHONDONTWRITEBYTECODE=1 .venv/bin/ruff check aiograpi/extractors.py aiograpi/mixins/public.py aiograpi/mixins/media.py aiograpi/init.py tests/regression/test_public.py tests/regression/test_media_pagination.py tests/regression/test_upstream_sync.py
• PYTHONDONTWRITEBYTECODE=1 .venv/bin/pytest -q tests/regression
• uv lock --check
• git diff --check
• PYTHONDONTWRITEBYTECODE=1 .venv/bin/python -m build --sdist --wheel --outdir /tmp/aiograpi-dist-1.11.1

Live public smoke against Instagram hit 429 Too Many Requests, so this PR verifies the crash and current payload handling with regression fixtures rather than claiming live public endpoint success.