v46.1-ui-mt76: Argon theme + hardened WG tunnel + Link Health dashboard

基于 v46 正式版(mt76)只恢复 UI 层:
- luci-theme-argon 2.4.3: local-background-wins 登录页 + bg1.jpg fallback
- luci-app-argon-config: 去 ui.changes.apply, ACL mutator 移 write
- luci-app-wgtunnel: rpcd ucode 后端(get/status/prepare/apply/rollback/reconnect),
  JSONMap 前端, 60s 一次性 token, 快照回滚, 无全局 network ACL
- luci-app-tr3000-status: 只读 rpcd ucode + 5s 轮询仪表盘
- tools/: audit_ui_packages.py + install_preview.sh + rollback_watchdog.sh
- docs/: 开发经历与翻车记录 + 固件哈希记录

固件本体(含烤入 WG 私钥/PSK)不入 git, 仅 K 盘保存.
kernel 成员与 v46 byte-identical; 尚未刷机.

immortalwrt-patches/feeds/luci/themes/luci-theme-argon/root/etc/uci-defaults/30_luci-theme-argon

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if [ "$PKG_UPGRADE" != 1 ]; then
+	uci get luci.themes.Argon >/dev/null 2>&1 || \
+	uci batch <<-EOF
+		set luci.themes.Argon=/luci-static/argon
+		set luci.main.mediaurlbase=/luci-static/argon
+		commit luci
+	EOF
+fi
+
+exit 0