chore(deploy): JAR 备份保留数量改回 10 个

deploy/deploy.sh

         ls -lh ${REMOTE_DIR}/backup/ | tail -5
         # 清理旧备份，保留最近 10 个
         BACKUP_COUNT=\$(ls -1t ${REMOTE_DIR}/backup/${APP_NAME}-*.jar 2>/dev/null | wc -l)
-        if [ "\$BACKUP_COUNT" -gt 3 ]; then
-            ls -1t ${REMOTE_DIR}/backup/${APP_NAME}-*.jar | tail -n +4 | xargs -r rm -f
-            echo "  已清理旧备份，保留最近 3 个"
+        if [ "\$BACKUP_COUNT" -gt 10 ]; then
+            ls -1t ${REMOTE_DIR}/backup/${APP_NAME}-*.jar | tail -n +11 | xargs -r rm -f
+            echo "  已清理旧备份，保留最近 10 个"
         fi
     else
         echo '  无现有版本，跳过备份'