feat: 新增人员徘徊/静止行为分析功能

本次提交实现了完整的人员行为分析系统，包括：
1. 新增基于位置和跟踪ID的两种行为检测算法
2. 新增徘徊检测服务与行为处理器模块
3. 前后端集成算法配置界面与告警展示
4. 支持图片和视频流场景下的行为分析
5. 新增算法配置接口与文档说明

具体改动：
- 新增loitering_detection模型目录与算法实现
- 新增AlgorithmConfig组件实现可视化配置
- 扩展图片/视频检测接口支持算法参数传递
- 新增行为告警推送与前端展示页面
- 优化检测服务，集成行为分析逻辑
- 移除冗余日志输出，完善代码注释

models/loitering_detection/processors/__init__.py

@@ -0,0 +1,8 @@
+"""
+徘徊检测处理器模块
+用于对检测结果进行后处理
+"""
+
+from .behavior_processor import BehaviorProcessor
+
+__all__ = ['BehaviorProcessor']

models/loitering_detection/processors/behavior_processor.py

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+"""
+行为检测处理器
+集成基于位置和基于跟踪ID的检测算法
+"""
+
+import sys
+import os
+import logging
+from typing import Dict, List, Optional, Tuple
+from dataclasses import dataclass
+
+# 添加算法模块路径
+sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
+
+from algorithms import PositionBasedStationaryDetector, LoiteringDetector
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class BehaviorAlert:
+    """行为告警"""
+    alert_type: str  # 'stationary', 'loitering'
+    level: str       # 'low', 'medium', 'high'
+    message: str
+    person_id: Optional[str] = None
+    position_id: Optional[str] = None
+    duration: float = 0.0
+    bbox: Optional[Tuple[int, int, int, int]] = None
+
+
+class BehaviorProcessor:
+    """
+    行为检测处理器
+    
+    整合两种检测方式：
+    1. 基于位置的静止检测（无需跟踪ID）
+    2. 基于跟踪ID的徘徊检测（需要跟踪ID）
+    """
+    
+    def __init__(
+        self,
+        # 静止检测参数
+        stationary_threshold: float = 10.0,
+        position_tolerance: int = 50,
+        
+        # 徘徊检测参数
+        loitering_threshold: float = 300.0,
+        movement_threshold: float = 5.0,
+        
+        # 告警参数
+        enable_stationary_alert: bool = True,
+        enable_loitering_alert: bool = True,
+        stationary_alert_threshold: float = 10.0,  # 超过此时间产生告警
+        loitering_alert_threshold: float = 300.0   # 超过此时间产生告警
+    ):
+        # 初始化检测器
+        self.stationary_detector = PositionBasedStationaryDetector(
+            stationary_threshold=stationary_threshold,
+            position_tolerance=position_tolerance
+        )
+        
+        self.loitering_detector = LoiteringDetector(
+            loitering_threshold=loitering_threshold,
+            stationary_threshold=stationary_threshold,
+            movement_threshold=movement_threshold
+        )
+        
+        # 配置
+        self.enable_stationary_alert = enable_stationary_alert
+        self.enable_loitering_alert = enable_loitering_alert
+        self.stationary_alert_threshold = stationary_alert_threshold
+        self.loitering_alert_threshold = loitering_alert_threshold
+    
+    def process(
+        self,
+        detections: List[Dict],
+        use_tracking: bool = False,
+        track_id_key: str = 'track_id'
+    ) -> Dict:
+        """
+        处理检测结果，检测行为
+
+        Args:
+            detections: 检测结果列表
+            use_tracking: 是否使用跟踪ID（如果有的话）
+            track_id_key: 跟踪ID字段名
+
+        Returns:
+            {
+                'detections': 添加行为信息的检测结果,
+                'alerts': 触发的告警列表,
+                'stats': 统计信息
+            }
+        """
+        logger.info(f"[BehaviorProcessor] 开始处理 {len(detections)} 个检测结果")
+        logger.info(f"[BehaviorProcessor] 配置: stationary={self.enable_stationary_alert}, loitering={self.enable_loitering_alert}")
+
+        alerts = []
+
+        # 1. 始终进行基于位置的静止检测
+        logger.info(f"[BehaviorProcessor] 调用静止检测器...")
+        detections = self.stationary_detector.detect(detections)
+        logger.info(f"[BehaviorProcessor] 静止检测完成，检测到 {len(detections)} 个结果")
+
+        # 检查静止告警
+        stationary_alerts = 0
+        if self.enable_stationary_alert:
+            for det in detections:
+                info = det.get('stationary_info', {})
+                if info.get('is_stationary') and info.get('duration', 0) >= self.stationary_alert_threshold:
+                    alert = BehaviorAlert(
+                        alert_type='stationary',
+                        level='medium' if info['duration'] < 30 else 'high',
+                        message=f"人员静止停留 {int(info['duration'])} 秒",
+                        position_id=info.get('position_id'),
+                        duration=info['duration'],
+                        bbox=tuple(det['bbox'])
+                    )
+                    alerts.append(alert)
+                    stationary_alerts += 1
+            logger.info(f"[BehaviorProcessor] 静止告警: {stationary_alerts} 个")
+
+        # 2. 如果有跟踪ID，进行徘徊检测
+        logger.info(f"[BehaviorProcessor] use_tracking={use_tracking}")
+        if use_tracking:
+            detections = self.loitering_detector.detect(detections, id_key=track_id_key)
+            
+            # 检查徘徊告警
+            if self.enable_loitering_alert:
+                for det in detections:
+                    info = det.get('loitering_info', {})
+                    if info.get('is_loitering') and info.get('loitering_duration', 0) >= self.loitering_alert_threshold:
+                        alert = BehaviorAlert(
+                            alert_type='loitering',
+                            level='high',
+                            message=f"人员徘徊 {int(info['loitering_duration'] // 60)} 分钟",
+                            person_id=str(info.get('person_id')),
+                            duration=info['loitering_duration'],
+                            bbox=tuple(det['bbox'])
+                        )
+                        alerts.append(alert)
+        
+        # 统计信息
+        stats = {
+            'total_detections': len(detections),
+            'stationary_count': len(self.stationary_detector.get_all_stationary()),
+            'alert_count': len(alerts)
+        }
+
+        if use_tracking:
+            stats.update({
+                'loitering_count': len(self.loitering_detector.get_all_loitering()),
+                'tracking_count': self.loitering_detector.get_stats()['total_tracks']
+            })
+
+        logger.info(f"[BehaviorProcessor] 处理完成: {stats}")
+
+        return {
+            'detections': detections,
+            'alerts': [self._alert_to_dict(a) for a in alerts],
+            'stats': stats
+        }
+    
+    def _alert_to_dict(self, alert: BehaviorAlert) -> Dict:
+        """将告警对象转换为字典"""
+        return {
+            'type': alert.alert_type,
+            'level': alert.level,
+            'message': alert.message,
+            'person_id': alert.person_id,
+            'position_id': alert.position_id,
+            'duration': round(alert.duration, 2),
+            'bbox': alert.bbox
+        }
+    
+    def get_stationary_persons(self) -> List[Dict]:
+        """获取所有静止人员"""
+        return self.stationary_detector.get_all_stationary()
+    
+    def get_loitering_persons(self) -> List[Dict]:
+        """获取所有徘徊人员"""
+        return self.loitering_detector.get_all_loitering()
+    
+    def reset(self):
+        """重置所有检测器"""
+        self.stationary_detector.reset()
+        self.loitering_detector.reset()
+    
+    def get_config(self) -> Dict:
+        """获取当前配置"""
+        return {
+            'stationary_threshold': self.stationary_detector.stationary_threshold,
+            'position_tolerance': self.stationary_detector.position_tolerance,
+            'loitering_threshold': self.loitering_detector.loitering_threshold,
+            'movement_threshold': self.loitering_detector.movement_threshold,
+            'enable_stationary_alert': self.enable_stationary_alert,
+            'enable_loitering_alert': self.enable_loitering_alert,
+            'stationary_alert_threshold': self.stationary_alert_threshold,
+            'loitering_alert_threshold': self.loitering_alert_threshold
+        }