Add chardet-based _decode_html_content() to aniworld_provider. Apply
to all BeautifulSoup parsing calls to prevent decoding warnings on
pages with mismatched encoding declarations. Falls back to utf-8
with errors='replace' when confidence < 0.7.
Also fix test_enhanced_provider HLS test signature and add HLS
pattern unit tests.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Iterate providers actually advertised on the episode page (ordered by
SUPPORTED_PROVIDERS preference) instead of always re-resolving VOE.
Each candidate is HEAD-probed before yt-dlp runs, so dead links are
skipped immediately; direct video URLs use a streaming fast path that
bypasses yt-dlp; total failure now logs the exhausted provider list.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
