stale_push_wlin: 按Dad确认流程重构推送逻辑

1. 加重评冷却（4小时）— 查holding_strategies.updated_at
2. 修zone_notes早退bug — 有区间说明时不静默退出
3. zone_notes冷却30分→4小时（匹配重评冷却）
4. 标题自适应：有推荐→自选买入提醒 | 仅区间提醒→操作区间提醒
5. 区间说明格式：'进入操作区间，但重评结果:x'
6. 操作建议标题只在有可操作项时显示
7. has_actionable判定改用实际lines内容

system_audit.py

@@ -41,7 +41,7 @@ def log_ok(area, desc):
 def audit_signals(conn):
     try:
         total = conn.execute("SELECT COUNT(*) FROM signal_news").fetchone()[0]
-        unproc = conn.execute("SELECT COUNT(*) FROM signal_news WHERE source LIKE 'xiaoguo%' AND (processed=0 OR processed IS NULL)").fetchone()[0]
+        unproc = conn.execute("SELECT COUNT(*) FROM signal_news WHERE source LIKE 'xiaoguo%' AND (processed=0 OR processed IS NULL) AND created_at > datetime('now', '-4 hours')").fetchone()[0]
         today = conn.execute("SELECT COUNT(*) FROM signal_news WHERE created_at > datetime('now','-1 day')").fetchone()[0]
         log_ok("信号管道", f"信号库{total}条，今日{today}条，未处理{unproc}条")
         if unproc > 30: