feat(core,meta,app,android,ios,cli): TVmaze for the shows AniList does not have

With AniList chosen, a title AniList has no match for is now searched on
TVmaze, keyless, before it is given up on. One provider for the whole library
left live-action shows in a share of anime unmatched, and switching to TMDB
would have dropped every AniList match, chain and shelf.

The service holds a chain of providers. A match is stored under the provider
that gave it, and enrichment and refreshes go to that provider; a miss is
stored under the last provider asked, and is_fresh only trusts a miss from the
end of the chain, so AniList misses stored before this are asked again at once.
A provider failure still ends the lookup instead of falling through.

The hand matcher searches every provider in the chain and labels each result
with its source. TVmaze is never offered in the settings and is not asked
about titles known to be films.

docs/DEVELOPMENT.md

@@ -10,7 +10,7 @@
 | `pstr-stream` — block cache, read-ahead | **done, live-verified** — 68 offline tests; benchmarked against a real 761 MiB episode (see `docs/TESTING.md`) |
 | `pstr-player` — libmpv `stream_cb` + render API | **done, live-verified** — 33 offline tests; plays a real 1080p HEVC episode over a public link, seeks, resumes from the disk cache, and renders into the app's GL context |
 | `pstr-app` — egui UI, poster grid, embedded video | **done, offline-tested** — 15 offline tests; library wall, title pages, player page with overlay controls, themes, share management |
-| Metadata providers (AniList / TMDB) | **done** — 32 offline tests; posters, synopses, per-episode titles, hand-pinned matches. Opt-in, off by default |
+| Metadata providers (AniList, then TVmaze / TMDB) | **done** — 32 offline tests; posters, synopses, per-episode titles, hand-pinned matches. Opt-in, off by default |
 | Packaging | **done, locally verified** — `scripts/build.sh` (tarball, `.deb`, `.rpm`, `.app`, `.dmg`) and `scripts/build.ps1` (portable `.zip`, WiX `.msi`), plus `packaging/PKGBUILD`. See `packaging/README.md`. The macOS half is written but has not been run on a Mac |
 
 ## Build order from here