fix(video): group every episode under the show's own folder, not a per-file guessit title

The mechanism itself was wrong, not just the TMDB matching: a bare episode
numbering convention with no show name in the filename at all
(`001    Episode's Own Title.ext`, no SxxExx, no show prefix — entirely
ordinary on its own) makes guessit invent a "title" from whatever text
follows the number. That text is the individual episode's own name, and
differs for every episode in the folder — trusting it, as the code did,
groups nothing together at all: every episode became its own single-
episode "show", searched against TMDB by that one-off title alone.

Whenever a season-like ancestor folder exists (a numbered season, or
Specials/Bonus/Extras -> season 0), its own root folder now names the show
unconditionally — never a per-file guessit title, which cannot tell a
show's real name from an individual episode's one-off name when the
filename carries no reliable ShowName/SxxExx structure. The walk continues
past *every* consecutive season-like ancestor, not just the first: a
per-season Bonus folder (Show/Season N/Bonus/file.ext) is nested two
levels inside the show, both "Bonus" and "Season N" season-like on their
own, and stopping at the first would hand back "Season N" as the show's
name instead of "Show".

Also adds "livre" ("book") to the season-word vocabulary (§3.4) — some
shows number their seasons that way (Roman numerals) rather than
"season"/"saison".

Supersedes _title_from_show_siblings from the previous commit (removed):
that fallback assumed a per-file title could still be trusted often
enough to be worth borrowing from a sibling season folder — this fix
means it never needs trusting in the first place once a season-like
ancestor exists.

Verified directly against the real library this was found on, not just
synthetic tests: every sample file (a numbered episode, a Book/Bonus
feature, a Book-root "making of") now resolves to the show's real name.

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