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/run-memind-portal-prod.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Memind Portal 生产进程（g2.tkmind.cn / Plaza API 共用 :8081）
+# Memind Portal 生产进程（m.tkmind.cn / Plaza API 共用 :8081）
 set -euo pipefail
 
 ROOT="$(cd "$(dirname "$0")/.." && pwd)"
@@ -14,6 +14,7 @@ fi
 
 export NODE_ENV=production
 export H5_PORT="${H5_PORT:-8081}"
+export H5_PUBLIC_BASE_URL="https://m.tkmind.cn"
 export TKMIND_API_TARGET="${TKMIND_API_TARGET_OVERRIDE:-https://127.0.0.1:18006}"
 export TKMIND_API_TARGET_1="${TKMIND_API_TARGET_1_OVERRIDE:-https://127.0.0.1:18007}"