fix(core,meta,app,android,cli): number episodes the way releases do

AniList's per-season lookup searched for "<title> 2nd Season" and the
scorer picked the base entry again, so Attack on Titan seasons 2-4 and
Jigokuraku season 2 were captioned with season one's names. Episode
names came from streamingEpisodes, which is partial and numbered however
a streaming site counted. Bleach S17 and Mushishi S02/S03 had none.

AniList now walks SEQUEL relations from the match and takes each
entry's episodes from ani.zip, which carries TVDB's season, number and
absolute number. An episode row keeps all three plus its place in the
AniList entry. EpisodeGuide::get matches whichever numbering a file
uses and never answers from another season.

Episodes and fanart are stored as one enrichment. The episode list is
replaced even when empty, and the enrichment is recorded as asked, so a
film is not re-asked every run. Storing a different match drops the old
entry's episode rows. AniList's 4.75:1 bannerImage is no longer stored
as the 16:9 backdrop; ani.zip's 1920x1080 fanart is used instead.

Schema v9 adds the columns and deletes the AniList episode rows and
banners. Matches are kept. Desktop, Android and the CLI now share
service::plan and MetadataService::work. The settings text names
ani.zip. Audit and roadmap in docs/METADATA.md; bug entry B61.

docs/BUGS.md

@@ -146,6 +146,51 @@ and [B44](#b44--r8-broke-the-app-under-instrumentation-in-five-places).
 
 ## Fixed
 
+### B61 — later seasons were captioned with season one's episode names
+
+**Symptom.** On a 42-title AniList library, Attack on Titan seasons 2–4 and
+Jigokuraku season 2 showed season one's episode names. Dan Da Dan, Kaiju No. 8
+and The Apothecary Diaries had a handful of names numbered past the end of the
+season. Bleach's had 20 rows called `Untitled`. Bleach `S17` (the Thousand-Year
+Blood War) and Mushishi `S02`/`S03` had none at all. Jujutsu Kaisen 0 kept the
+TV series' names after it was re-pinned to the film. Every desktop tile drew a
+blurred strip of AniList banner.
+
+**Cause.** Four, independent.
+
+- `season_episodes` searched for `<title> 2nd Season`, and the scorer, seeing
+  the base entry's alias inside the query, picked the base entry again. That
+  search was [B11](#b11--seasons-past-the-first-had-no-episode-names-and-were-one-query-from-having-the-wrong-ones)'s
+  fix, and it only worked where the sequel's name scored higher than the base's.
+- `streamingEpisodes` is what a streaming site published: partial, and
+  numbered however that site counted.
+- A release's season is not an AniList entry. `S17` is four entries, and
+  Mushoku Tensei's `S01` is two.
+- An empty episode list was never written, so a re-match kept the old one.
+  `bannerImage`, a 4.75:1 strip, was stored as the 16:9 backdrop.
+
+**Fix.** AniList walks `SEQUEL` relations from the match. Each entry's episodes
+come from ani.zip with TVDB's season, number and absolute number, plus the
+entry's own numbering. `EpisodeGuide::get` meets whichever of those a filename
+used without ever crossing seasons. Enrichment is stored as one unit,
+replaced even when empty and recorded as asked. A changed match drops the old
+entry's rows at once. The backdrop is ani.zip's 1920×1080 fanart, and the
+banner is no longer stored. Schema v9 deletes the bad rows. See
+[METADATA.md](METADATA.md).
+
+**Verified.** `EpisodeGuide` tests in `pstr_core::metadata` (absolute numbers
+in a season folder, by-entry seasons, no season crossing), and the catalog's
+`an_empty_enrichment_clears_the_episodes_the_last_match_left`,
+`pinning_a_different_entry_drops_the_old_entrys_episodes_at_once` and
+`upgrading_drops_anilists_episode_rows_and_banners_but_keeps_its_matches`.
+Live, against a copy of the same library through `pstr metadata match`:
+
+- 0 lookups failed.
+- Every numbered file is answered except 2 Attack on Titan files, 2 Bleach
+  files and one Mushoku Tensei special, which TVDB does not list.
+- 29 of 44 matched titles have fanart, and none has a banner.
+- A second run asks nothing.
+
 ### B60 — a failed "Add and crawl" left the crawl spinner running forever
 
 **Symptom.** Pasting a link without its `#` fragment, or one already added,