Add smart ACK provider for WeChat MP replies

Replace fixed ackText with a rule-based AckProvider that picks
response templates by message type and intent (translate, summary,
rewrite, poster, ppt, mindmap, code, search, schedule). Pure sync,
zero I/O, auto-falls back to config.ackText on any error.

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

scripts/install-g2-lb.sh

@@ -92,4 +92,4 @@ curl -s -o /dev/null -w "105  upstream :18080 → %{http_code}\n" http://127.0.0
 curl -s -o /dev/null -w "Caddy LB      :8090 → %{http_code}\n" http://127.0.0.1:8090/api/status || true
 echo ""
 echo "日志: ~/Library/Logs/g2-h5-tunnel.log ~/Library/Logs/g2-lb.log"
-echo "外网验证: curl -sI https://g2.tkmind.cn/api/status"
+echo "外网验证: curl -sI https://m.tkmind.cn/api/status"