Show purchase times in ticket alerts

pages/🎟️ 售票时间集中监控.py

@@ -665,7 +665,9 @@ class TicketSnapshotMonitor:
                 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))
+            purchase_dt = parse_datetime_text(event.get("snapshot_at"))
+            purchase_time = purchase_dt.strftime("%H:%M") if purchase_dt else "--:--"
+            point_deltas.append(f"{delta}({purchase_time})")
         point_delta_text = " / ".join(point_deltas) if point_deltas else "--"
         return "\n".join(
             [