Album-Download: Umlaute (UTF-8 BOM) + Copyright-Hinweis

- liner-de.txt: echte Umlaute statt ASCII-Ersatz, UTF-8-BOM für korrekte
  Anzeige auch auf Windows
- Copyright in beiden Linern + als ID3-copyright-Feld auf jedem Song:
  "Kommerzielle Nutzung nur nach Absprache (banyaro.app)"
- ZIPs neu gebaut (make album); LIVE auf Prod + Staging

tools/album-build/build.sh

@@ -61,6 +61,12 @@ zip_album() {  # $1=lang  $2=AlbumName(ID3, Em-Dash ok)  $3=Ordner(ASCII)  $4=ar
   local folder="$DIST/$fname"; rm -rf "$folder"; mkdir -p "$folder"
   if [ "$lang" = "de" ]; then cp "$liner" "$folder/LIESMICH.txt"; else cp "$liner" "$folder/README.txt"; fi
   cp "$art" "$folder/cover.jpg"
+  local copyr
+  if [ "$lang" = "de" ]; then
+    copyr="© 2026 Ban Yaro — Alle Rechte vorbehalten. Kommerzielle Nutzung nur nach Absprache (banyaro.app)."
+  else
+    copyr="© 2026 Ban Yaro — All rights reserved. Commercial use only by prior arrangement (banyaro.app)."
+  fi
   local n=0 line src title sub nn
   for line in "$@"; do
     n=$((n+1)); nn=$(printf "%02d" "$n")
@@ -70,7 +76,8 @@ zip_album() {  # $1=lang  $2=AlbumName(ID3, Em-Dash ok)  $3=Ordner(ASCII)  $4=ar
       -metadata title="$title" -metadata artist="Ban Yaro" \
       -metadata album="$album" -metadata album_artist="Ban Yaro" \
       -metadata track="$n/7" -metadata date="2026" -metadata genre="Blues" \
-      -metadata comment="$sub" -disposition:v:0 attached_pic \
+      -metadata copyright="$copyr" -metadata comment="$sub" \
+      -disposition:v:0 attached_pic \
       "$folder/$nn $title.mp3"
   done
   ( cd "$DIST" && rm -f "$DL/ban-yaro-album-$lang.zip" && zip -r -X -q "$DL/ban-yaro-album-$lang.zip" "$fname" )