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/memind-fwd-tunnel.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Studio→105 正向隧道：本机 127.0.0.1:18080 → 105 的 127.0.0.1:8080（goose-h5 portal）
+# Studio→105 正向隧道：本机 127.0.0.1:18080 → 105 的 127.0.0.1:8080（memind-h5 portal）
 # 供 g2-lb Caddy 把一部分 g2 流量加权分到 105，同协议(HTTP) + SSH 加密私网
 set -euo pipefail
 exec ssh -N   -o ServerAliveInterval=30   -o ServerAliveCountMax=3   -o ExitOnForwardFailure=yes   -L 127.0.0.1:18080:127.0.0.1:8080   ssh105