chore: 移除人群聚集检测算法预置

- SQL初始化脚本移除 crowd_detection
- Java预置算法移除 crowd_detection
- 与边缘端保持一致，仅保留2个算法

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

数据库/aiot/初始化-mysql-aiot.sql

@@ -70,7 +70,7 @@ CREATE TABLE IF NOT EXISTS wvp_ai_config_log (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='配置变更日志';
 
 -- ============================================================
--- 初始数据：预置算法（2个，不含人群聚集检测）
+-- 初始数据：预置算法（2个，与边缘端保持一致）
 -- ============================================================
 INSERT INTO wvp_ai_algorithm (algo_code, algo_name, target_class, param_schema, description, is_active, create_time, update_time) VALUES
 ('leave_post', '离岗检测', 'person', '{"confirm_on_duty_sec":{"type":"int","default":10,"min":1},"confirm_leave_sec":{"type":"int","default":10,"min":1},"cooldown_sec":{"type":"int","default":300,"min":0},"working_hours":{"type":"list","default":[]}}', '检测人员是否在岗，支持工作时间段配置', 1, NOW(), NOW()),