feat(sacd): support raw and DST-compressed ISO playback

Parse resilient SACD images, decode DST, scan ISO releases into the local library, and keep explicit opens ephemeral.

Ship decoder notices across distribution formats and align DSD album filtering and version selection.

cx

scripts/packaging/test_aur_packages.sh

@@ -58,6 +58,7 @@ install -m644 packaging/linux/qbz.desktop "$qbz_dir/qbz.desktop"
 install -m644 packaging/flatpak/com.blitzfc.qbz.metainfo.xml \
     "$qbz_dir/com.blitzfc.qbz.metainfo.xml"
 install -m644 LICENSE "$qbz_dir/LICENSE"
+cp -r licenses "$qbz_dir/licenses"
 for size in 32 48 64 128 256 512; do
     install -m644 "packaging/icons/${size}x${size}.png" \
         "$qbz_dir/icons/hicolor/${size}x${size}/apps/qbz.png"
@@ -71,6 +72,7 @@ install -m755 "$qbzd_test_bin" "$qbzd_dir/qbzd"
 install -m644 crates/qbzd/service/qbzd.service "$qbzd_dir/qbzd.service"
 install -m644 packaging/linux/qbzd-standalone-README.md "$qbzd_dir/README.md"
 install -m644 LICENSE "$qbzd_dir/LICENSE"
+cp -r licenses "$qbzd_dir/licenses"
 "$qbzd_test_bin" completions bash > "$qbzd_dir/completions/qbzd.bash"
 "$qbzd_test_bin" completions zsh > "$qbzd_dir/completions/qbzd.zsh"
 "$qbzd_test_bin" completions fish > "$qbzd_dir/completions/qbzd.fish"
@@ -111,6 +113,7 @@ for package in "${selected_packages[@]}"; do
             case "$PACKAGE" in
                 qbz|qbz-bin)
                     grep -aFq "QBZ/${VERSION}" /usr/bin/qbz
+                    test -f /usr/share/licenses/${PACKAGE}/third-party/Apache-2.0-dst-decoder.txt
                     set +e
                     QT_QPA_PLATFORM=offscreen timeout 20 qbz >/tmp/qbz-smoke.log 2>&1
                     status=$?
@@ -123,6 +126,7 @@ for package in "${selected_packages[@]}"; do
                     ;;
                 qbzd|qbzd-bin)
                     qbzd version | grep -F "qbzd ${VERSION} "
+                    test -f /usr/share/licenses/${PACKAGE}/third-party/Apache-2.0-dst-decoder.txt
                     qbzd completions bash >/dev/null
                     test -f /usr/lib/systemd/user/qbzd.service
                     qbzd service systemd --user builder --bin /usr/bin/qbzd \