Clarify concentrated ticket alert copy

pages/🎟️ 售票时间集中监控.py

@@ -655,21 +655,26 @@ class TicketSnapshotMonitor:
                     self._increment_stat_locked("notify_fails")
                 self.log(f"弱监控告警未发送：{format_session_label(session)}，点数 {len(events)}。")
 
-    def _build_alert_message(self, session: dict, events: List[dict], config: dict) -> str:
-        latest_event = events[-1] if events else {}
+    def _build_alert_message(self, session: dict, events: List[dict], _config: dict) -> str:
         start_dt = parse_datetime_text(session.get("start_dt"))
         start_text = start_dt.strftime("%m月%d日 %H:%M") if start_dt else str(session.get("start_time") or "--")
+        point_deltas = []
+        for event in events:
+            delta = safe_int(event.get("delta"), default=-1)
+            if delta < 0:
+                from_sold = safe_int(event.get("from_sold")) or 0
+                to_sold = safe_int(event.get("to_sold")) or 0
+                delta = max(0, to_sold - from_sold)
+            point_deltas.append(str(delta))
+        point_delta_text = " / ".join(point_deltas) if point_deltas else "--"
         return "\n".join(
             [
                 "发现疑似集中购票",
                 "",
                 f"{session.get('hall_display') or clean_hall_name(session.get('hall_name'))} {start_text}",
                 f"《{session.get('movie_name') or '未知影片'}》",
-                f"当前已售：{int(session.get('sold') or 0)} 人",
                 f"集中购票点数：{len(events)}",
-                f"最近命中：{latest_event.get('snapshot_at', '--')}，+{latest_event.get('delta', 0)} 人",
-                "",
-                f"规则：相邻快照 {int(config.get('increase_threshold') or 4)} 人及以上增长记 1 点，开场前 {int(config.get('notify_lead_minutes') or 20)} 分钟推送。",
+                f"点数数量：{point_delta_text}",
             ]
         )