Expose Threads badge user fields

[subzeroid]

Summary

• expose Instagram profile Threads badge fields on User as show_text_post_app_badge and text_post_app_badge_label
• preserve those fields from both private v1 and public GraphQL user payloads
• add regression coverage for both extractor paths

Verification

• RED: new tests failed before the model fields were added with AttributeError: User object has no attribute show_text_post_app_badge
• PYTHONDONTWRITEBYTECODE=1 .venv/bin/pytest -q tests/regression/test_user.py
• PYTHONDONTWRITEBYTECODE=1 .venv/bin/ruff check aiograpi/types.py tests/regression/test_user.py
• PYTHONDONTWRITEBYTECODE=1 .venv/bin/pytest -q tests/regression
• private live smoke verified user_info_by_username_v1 returns show_text_post_app_badge=True and text_post_app_badge_label for a public profile with a Threads badge

Closes #397