Add Verbose log level between Info and Debug

Implemented full log level hierarchy: Fatal, Error, Warn, Info, Verbose, Debug.
- Verbose level (-v) shows detailed operations like file changes (M/A/D)
- Debug level (-vv) shows low-level tracing with caller info
- Quiet mode (-q) sets level to Error, suppressing Info messages
- Banner and summary output now use log levels for filtering

internal/cli/fetch.go

@@ -125,17 +125,15 @@ func (mfa *CLIApp) fetchManifestOperation(ctx *cli.Context) error {
 	close(progress)
 	<-done
 
-	// Print summary if not quiet
-	if !ctx.Bool("quiet") {
-		elapsed := time.Since(startTime)
-		avgBytesPerSec := float64(totalBytes) / elapsed.Seconds()
-		avgRate := formatBitrate(avgBytesPerSec * 8)
-		log.Infof("downloaded %d files (%.1f MB) in %.1fs (%s avg)",
-			len(files),
-			float64(totalBytes)/1e6,
-			elapsed.Seconds(),
-			avgRate)
-	}
+	// Print summary
+	elapsed := time.Since(startTime)
+	avgBytesPerSec := float64(totalBytes) / elapsed.Seconds()
+	avgRate := formatBitrate(avgBytesPerSec * 8)
+	log.Infof("downloaded %d files (%.1f MB) in %.1fs (%s avg)",
+		len(files),
+		float64(totalBytes)/1e6,
+		elapsed.Seconds(),
+		avgRate)
 
 	return nil
 }