Add JAR parser: extract audio/subtitle labels from BD-J menus

Scans BDMV/JAR/*.jar class files for track label patterns:
 eng_MLP_ → TrueHD, eng_ADES_US_ → Descriptive Audio (US)
 dan_PGStream4 → Danish subtitles

Solves the "3x AC-3 English" problem — we identify Descriptive Audio, commentary, compatibility tracks.

Future: set MKV "visual impaired" flag automatically during mux.

Local only — needs more disc samples to validate before publishing.

Cargo.toml

@@ -15,6 +15,7 @@ sha1 = "0.10"
 aes = "0.8"
 cbc = "0.1"
 flate2 = "1"
+zip = { version = "2", default-features = false, features = ["deflate"] }
 
 [target.'cfg(target_os = "linux")'.dependencies]
 libc = "0.2"