refactor(aiot): 算法抽帧频率改为固定展示，不允许用户配置

- 离岗检测：固定 3帧/秒
- 周界入侵：固定 1帧/秒
- 从 paramSchema 中删除 frame_rate 参数
- 在算法描述中添加固定帧率说明
- 帧率配置统一在边缘端管理

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

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

@@ -40,12 +40,12 @@ public class AiAlgorithmServiceImpl implements IAiAlgorithmService {
     static {
         // 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",
-                "{\"leave_countdown_sec\":{\"type\":\"int\",\"default\":300,\"min\":0},\"frame_rate\":{\"type\":\"float\",\"default\":3.0,\"options\":[10.0,5.0,3.0,1.0,0.33,0.1,0.03]},\"working_hours\":{\"type\":\"list\",\"default\":[]}}"
+                "离岗检测", "person", "检测人员是否在岗，支持工作时间段配置。算法抽帧频率：3帧/秒（固定）",
+                "{\"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",
-                "{\"cooldown_seconds\":{\"type\":\"int\",\"default\":300,\"min\":0},\"confirm_seconds\":{\"type\":\"int\",\"default\":5,\"min\":1},\"frame_rate\":{\"type\":\"float\",\"default\":1.0,\"options\":[10.0,5.0,3.0,1.0,0.33,0.1,0.03]}}"
+                "周界入侵检测", "person", "检测人员进入指定区域。算法抽帧频率：1帧/秒（固定）",
+                "{\"cooldown_seconds\":{\"type\":\"int\",\"default\":300,\"min\":0},\"confirm_seconds\":{\"type\":\"int\",\"default\":5,\"min\":1}}"
         });
         // 人群聚集检测暂时注释，边缘端未启用
         // PRESET_ALGORITHMS.put("crowd_detection", new String[]{