Initial commit: OpenWrt firewall management scripts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

update_tw_ip.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+# 下載最新台灣 IP 清單
+curl -s https://www.ipdeny.com/ipblocks/data/countries/tw.zone > /tmp/tw.zone
+
+# 更新集合 (fw4 會自動處理 auto-merge)
+nft flush set inet fw4 taiwan_ips
+for ip in $(cat /tmp/tw.zone); do
+    nft add element inet fw4 taiwan_ips { $ip }
+done
+
+# 萬一你的 VPS IP 沒被網段涵蓋，這邊可以手動補強 (選配)
+# nft add element inet fw4 taiwan_ips { 211.23.141.206 }
+
+logger "Firewall: Taiwan IP set updated."