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>

.gitignore

@@ -6,6 +6,7 @@ ops/dist/
 .env
 .env.local
 .env.*.local
+scripts/g2-aliyun-cert.env
 
 *.log
 *.pid
@@ -19,8 +20,3 @@ users/
 .idea/
 .vscode/
 .aider*
-
-scripts/g2-aliyun-cert.env
-scripts/__pycache__/
-*.bak-*
-temp/