fix(pack): regenerate custom mod URLs for current BASE_DOMAIN

The mods/*.pw.toml download URLs were frozen at ulicraft.lan; the stack
now uses ulicraft.net. Regenerate all nine with the current domain.

add-custom-mod.sh: skip the copy when source == hosted dest (`-ef`),
so `add-custom-mod.sh custom --force` works as an in-place regen.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tooling/add-custom-mod.sh

@@ -98,7 +98,9 @@ add_one() {  # $1 = jar path. Uses NAME (single-jar only), SIDE, FORCE, BASE_DOM
   fi
 
   hash="$(sha256sum -- "$jar" | cut -d' ' -f1)"
-  cp -- "$jar" "$dest"
+  # Skip the copy when the source already IS the hosted file (regen-in-place,
+  # e.g. `add-custom-mod.sh custom --force` to refresh URLs after a domain change).
+  [ "$dest" -ef "$jar" ] || cp -- "$jar" "$dest"
   cat > "$meta" <<EOF
 name = "${name}"
 filename = "${filename}"