Add album/track releases with audio analysis, AnalyzeAlbumRelease RPC, Docker path auto-resolution, release parsing decision tree

internal/audio/flac.go

@@ -0,0 +1,27 @@
+package audio
+
+import (
+	"fmt"
+
+	"github.com/mewkiz/flac"
+)
+
+func analyzeFLAC(filePath string) (*TrackInfo, error) {
+	stream, err := flac.ParseFile(filePath)
+	if err != nil {
+		return nil, fmt.Errorf("parsing FLAC: %w", err)
+	}
+	defer stream.Close()
+
+	info := stream.Info
+	durationMs := int(info.NSamples * 1000 / uint64(info.SampleRate))
+
+	return &TrackInfo{
+		Format:     "FLAC",
+		BitDepth:   int(info.BitsPerSample),
+		SampleRate: int(info.SampleRate),
+		Channels:   int(info.NChannels),
+		DurationMs: durationMs,
+		IsLossless: true,
+	}, nil
+}