feat: 传递离岗时长到告警记录

- ResultReporter AlertInfo 添加 duration_minutes
- main.py 使用 report_alert 替代 report_detection_alert
- _store_alert 保存 duration_minutes

main.py

@@ -311,18 +311,20 @@ class EdgeInferenceService:
             for alert in alerts:
                 self._performance_stats["total_alerts_generated"] += 1
                 
-                self._reporter.report_detection_alert(
+                from core.result_reporter import AlertInfo
+                alert_info = AlertInfo(
+                    alert_id=f"{roi_id}_{int(frame.timestamp.timestamp())}",
                     camera_id=camera_id,
                     roi_id=roi_id,
                     alert_type=alert.get("alert_type", "detection"),
-                    detection={
-                        "class_name": alert.get("message", "未知目标"),
-                        "confidence": alert.get("confidence", 1.0),
-                        "bbox": alert.get("bbox", []),
-                        "message": alert.get("message", ""),
-                    },
-                    screenshot=frame.image
+                    target_class=alert.get("class", "unknown"),
+                    confidence=alert.get("confidence", 1.0),
+                    bbox=alert.get("bbox", []),
+                    message=alert.get("message", ""),
+                    timestamp=frame.timestamp,
+                    duration_minutes=alert.get("duration_minutes"),
                 )
+                self._reporter.report_alert(alert_info, screenshot=frame.image)
                 
                 self._logger.log_alert(
                     alert.get("alert_type", "detection"),