feat: WeChat Linux bot via docker-wechatbot-webhook

- Docker container with auto-restart
- systemd webhook receiver on :5804
- Full send/receive loop: WeChat ↔ Docker ↔ Hermes
- Fixed login token for persistence
- Firewall rules for container-host communication

gateway/linux/mowechat.conf

@@ -0,0 +1,17 @@
+# MoWeChat Configuration
+# Bot API token (from docker-wechatbot-webhook)
+WECHAT_BOT_TOKEN="n~btHqwAmfQW"
+
+# WeChat contact name for the bot itself
+BOT_NAME="莫小荷"
+
+# User (Dad) contact info
+USER_NAME="莫语不语"
+USER_WXID="wxid_c0a6izmwd78y22"
+
+# Hermes Gateway
+HERMES_API="http://192.168.1.246:8642/v1/chat/completions"
+HERMES_KEY="hermes123"
+
+# Webhook receiver
+WEBHOOK_PORT=5804