refactor(aiot): 删除离岗检测算法的cooldown_sec参数

原因：状态机已保证必须回岗后才能再次告警
- ALARMED状态会一直等待人回岗
- 必须回到ON_DUTY状态后，人再次离开才能重新告警
- cooldown_sec参数是冗余的，移除简化配置

离岗检测算法参数（简化后）：
- confirm_on_duty_sec: 在岗确认时间
- confirm_leave_sec: 离岗确认时间
- leave_countdown_sec: 离岗倒计时
- working_hours: 工作时间段

注：其他算法（如intrusion）仍保留cooldown_seconds

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/java/com/genersoft/iot/vmp/aiot/service/impl/AiAlgorithmServiceImpl.java

@@ -41,7 +41,7 @@ public class AiAlgorithmServiceImpl implements IAiAlgorithmService {
         // algoCode -> {algoName, targetClass, description, paramSchema}
         PRESET_ALGORITHMS.put("leave_post", new String[]{
                 "离岗检测", "person", "检测人员是否在岗，支持工作时间段配置",
-                "{\"confirm_on_duty_sec\":{\"type\":\"int\",\"default\":10,\"min\":1},\"confirm_leave_sec\":{\"type\":\"int\",\"default\":30,\"min\":1},\"leave_countdown_sec\":{\"type\":\"int\",\"default\":300,\"min\":0},\"cooldown_sec\":{\"type\":\"int\",\"default\":600,\"min\":0},\"working_hours\":{\"type\":\"list\",\"default\":[]}}"
+                "{\"confirm_on_duty_sec\":{\"type\":\"int\",\"default\":10,\"min\":1},\"confirm_leave_sec\":{\"type\":\"int\",\"default\":30,\"min\":1},\"leave_countdown_sec\":{\"type\":\"int\",\"default\":300,\"min\":0},\"working_hours\":{\"type\":\"list\",\"default\":[]}}"
         });
         PRESET_ALGORITHMS.put("intrusion", new String[]{
                 "周界入侵检测", "person", "检测人员进入指定区域",