- Inject *slog.Logger into HybridStore, PocketBaseStore, and pbClient
- Fix credential defaults in main.go (changeme123 / admin) to match docker-compose
- listOne/listAll/upsert/deleteWhere now return errors on non-2xx HTTP status
- WriteChapter: log warn instead of discarding UpsertChapterIdx error
- MetadataMtime, GetAudioCache, GetProgress: log warn on PocketBase failures
- EnsureCollections: log info/debug/warn per outcome instead of _ = err
- CountChapterIdx: log warn on failure instead of silently returning 0
- server: log warn when SetAudioCache fails after audio generation
- NewHybridStore: add explicit Ping() before EnsureCollections for fast-fail on bad credentials
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