v0.6.3: add meta tags

[z00mable]

v0.6.3 — Automatic Metadata Tagging

Every downloaded chapter is now fully tagged so your audiobook player displays the correct information right away — no manual editing needed.

What's new

Embedded metadata in every file

All converted MP3 and M4B files now carry:

• Cover art — fetched from the book page and embedded as an attached picture
• Author — read from the original file's existing ID3 tags, with HTML as fallback
• Narrator — extracted where available (Tokybook and AudioAZ)
• Book title — set as the album tag, cleaned up (no more "Author – Title Audiobook" in the album field)
• Chapter title — set as the track title tag; numbered files like 01.mp3 become Chapter 1
• Track number — chapter position and total count (e.g. 3/24)
• Year — publication year, read directly from the original MP3's embedded tags (this info is often not visible on the website at all)
• Description — book synopsis, read from the original MP3 tags first, then from the page
• Genre — always set to Audiobook
• Publisher — where available (Tokybook)

More supported sites

Eight additional sites now supported, bringing the total to 10+ sites:

• goldenaudiobook.net, fulllengthaudiobooks.net, bigaudiobooks.net, findaudiobook.com, bookaudiobook.net, hotaudiobooks.com, audiozaic.com, appaudiobooks.com
• zaudiobooks.com, freeaudiobooks.top

Fixes

• Book title in the album tag no longer contains the author name or "Audiobook" suffix
• Chapter titles no longer show the raw filename (e.g. 01.mp3) — shown as Chapter 1 instead