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-portal-tunnel.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+# 反向 SSH 隧道：105 通过 127.0.0.1:19081 访问本机 Portal (:8081)
+set -euo pipefail
+
+HOST="${MEMIND_PORTAL_TUNNEL_HOST:-ssh105-public}"
+LOCAL_PORT="${MEMIND_PORTAL_TUNNEL_LOCAL_PORT:-8081}"
+REMOTE_PORT="${MEMIND_PORTAL_TUNNEL_REMOTE_PORT:-19081}"
+
+exec ssh -N \
+  -o ServerAliveInterval=30 \
+  -o ServerAliveCountMax=3 \
+  -o ExitOnForwardFailure=yes \
+  -R "127.0.0.1:${REMOTE_PORT}:127.0.0.1:${LOCAL_PORT}" \
+  "${HOST}"