Add deploy/setup.sh for one-command VPS setup

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

deploy/build.sh

@@ -36,7 +36,7 @@ for t in $TARGETS; do
 		[ -f "$f" ] && cp "$f" "$stage/"
 	done
 	if [ "$os" = linux ]; then
-		cp deploy/install.sh "deploy/$NAME.service" deploy/docker-compose.yml "$stage/"
+		cp deploy/install.sh deploy/setup.sh "deploy/$NAME.service" deploy/docker-compose.yml "$stage/"
 		chmod +x "$stage/install.sh"
 	fi
 	if [ "$os" = windows ] && command -v zip >/dev/null 2>&1; then