fix(storage): surface all silent errors with structured logging

- 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

scraper/cmd/scraper/main.go

@@ -99,8 +99,8 @@ func run(log *slog.Logger) error {
 	// ── Storage backends ────────────────────────────────────────────────────
 	minioCfg := storage.MinioConfig{
 		Endpoint:       envOr("MINIO_ENDPOINT", "localhost:9000"),
-		AccessKey:      envOr("MINIO_ACCESS_KEY", "minioadmin"),
-		SecretKey:      envOr("MINIO_SECRET_KEY", "minioadmin"),
+		AccessKey:      envOr("MINIO_ACCESS_KEY", "admin"),
+		SecretKey:      envOr("MINIO_SECRET_KEY", "changeme123"),
 		UseSSL:         strings.ToLower(os.Getenv("MINIO_USE_SSL")) == "true",
 		BucketChapters: envOr("MINIO_BUCKET_CHAPTERS", "libnovel-chapters"),
 		BucketAudio:    envOr("MINIO_BUCKET_AUDIO", "libnovel-audio"),
@@ -108,13 +108,13 @@ func run(log *slog.Logger) error {
 	pbCfg := storage.PocketBaseConfig{
 		BaseURL:       envOr("POCKETBASE_URL", "http://localhost:8090"),
 		AdminEmail:    envOr("POCKETBASE_EMAIL", "admin@libnovel.local"),
-		AdminPassword: envOr("POCKETBASE_PASSWORD", "adminpassword"),
+		AdminPassword: envOr("POCKETBASE_PASSWORD", "changeme123"),
 	}
 
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
 	defer stop()
 
-	store, err := storage.NewHybridStore(ctx, pbCfg, minioCfg)
+	store, err := storage.NewHybridStore(ctx, pbCfg, minioCfg, log)
 	if err != nil {
 		return fmt.Errorf("storage init failed: %w", err)
 	}