feat: 实现配置热更新机制

数据库扩展:
- roi_configs 新增算法参数字段（working_hours, confirm_on_duty_sec等）
- 新增 config_update_log 表记录配置变更日志

Redis缓存:
- ROI/摄像头配置缓存到 Redis（TTL 1小时）
- sync_all_to_redis() 批量同步配置
- notify_config_change() 发布配置变更通知

热更新:
- AlgorithmManager 订阅 Redis config_update 频道
- load_from_redis() 从 Redis 加载算法参数
- reload_algorithm() 热更新单个算法
- reload_all_algorithms() 重新加载所有算法

配置模型:
- ROIInfo 添加算法参数字段

config/config_models.py

@@ -104,6 +104,11 @@ class ROIInfo:
     alert_cooldown: int = 300
     enabled: bool = True
     extra_params: Optional[Dict[str, Any]] = None
+    working_hours: Optional[List[Dict]] = None  # 工作时间段
+    confirm_on_duty_sec: int = 10  # 在岗确认时间
+    confirm_leave_sec: int = 10  # 离岗确认时间
+    cooldown_sec: int = 300  # 告警冷却时间
+    target_class: str = "person"  # 目标类别
     
     def to_dict(self) -> Dict[str, Any]:
         """转换为字典"""
@@ -117,6 +122,11 @@ class ROIInfo:
             "alert_cooldown": self.alert_cooldown,
             "enabled": self.enabled,
             "extra_params": self.extra_params,
+            "working_hours": self.working_hours,
+            "confirm_on_duty_sec": self.confirm_on_duty_sec,
+            "confirm_leave_sec": self.confirm_leave_sec,
+            "cooldown_sec": self.cooldown_sec,
+            "target_class": self.target_class,
         }
     
     @classmethod
@@ -128,6 +138,14 @@ class ROIInfo:
         algo_type_str = data.get("algorithm_type", "leave_post")
         algo_type = AlgorithmType(algo_type_str) if algo_type_str in [e.value for e in AlgorithmType] else AlgorithmType.LEAVE_POST
         
+        working_hours = data.get("working_hours")
+        if isinstance(working_hours, str):
+            import json
+            try:
+                working_hours = json.loads(working_hours)
+            except:
+                working_hours = None
+        
         return cls(
             roi_id=data.get("roi_id", ""),
             camera_id=data.get("camera_id", ""),
@@ -138,6 +156,11 @@ class ROIInfo:
             alert_cooldown=data.get("alert_cooldown", 300),
             enabled=data.get("enabled", True),
             extra_params=data.get("extra_params"),
+            working_hours=working_hours,
+            confirm_on_duty_sec=data.get("confirm_on_duty_sec", 10),
+            confirm_leave_sec=data.get("confirm_leave_sec", 10),
+            cooldown_sec=data.get("cooldown_sec", 300),
+            target_class=data.get("target_class", "person"),
         )
     
     def is_point_inside(self, point: List[float]) -> bool: