Add structured logging and better error handling

internal/config/config.go

@@ -23,6 +23,8 @@ type Settings struct {
 	TrustProxyHeaders bool
 	DownloadDir       string
 	LibraryRoots      []string
+	LogLevel          string
+	LogFormat         string
 	Defaults          preferences.Preferences
 }
 
@@ -36,6 +38,8 @@ func Load() (Settings, error) {
 		SessionTTL:        time.Duration(reader.integer("SESSION_TTL_HOURS", 12)) * time.Hour,
 		TrustProxyHeaders: reader.boolean("TRUST_PROXY_HEADERS", false),
 		DownloadDir:       filepath.Clean(reader.text("DOWNLOAD_DIR", "/data/downloads")),
+		LogLevel:          reader.text("LOG_LEVEL", "info"),
+		LogFormat:         reader.text("LOG_FORMAT", "text"),
 		Defaults: preferences.Preferences{
 			MaxConcurrentDownloads: reader.integer("MAX_CONCURRENT_DOWNLOADS", 2),
 			ConnectionsPerDownload: reader.integer("CONNECTIONS_PER_DOWNLOAD", 4),