新增演示：构建隔离演示环境全套SQL种子资产与系统元数据基线

RuoYi-Vue/sql/demo/reset_demo_data.sql

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+-- ==============================================================================
+-- RailwaySystem Clean Demo 资产: reset_demo_data.sql
+-- 适用数据库: KingbaseES V009R003C018 (schema: public)
+-- 执行目标: 一键清空并重置所有 Demo 演示数据，将系统还原为黄金演示就绪状态
+-- 安全防护: 仅允许在 training_demo_clean 库执行，杜绝误触任何生产或共享测试库
+-- ==============================================================================
+
+DO $$
+DECLARE
+    v_db TEXT;
+BEGIN
+    SELECT current_database() INTO v_db;
+    IF v_db NOT LIKE '%demo%' THEN
+        RAISE EXCEPTION '>>> [RESET-FATAL] 当前数据库为 %，非 Demo 专属库，安全拒绝重置！', v_db;
+    END IF;
+    RAISE NOTICE '>>> [RESET-START] 正在重置 % 的演示数据...', v_db;
+END $$;
+
+BEGIN;
+
+-- 1. 逆序清理业务数据
+DELETE FROM public.train_external_operation;
+DELETE FROM public.train_external_resource_mapping;
+DELETE FROM public.train_student_portrait;
+DELETE FROM public.train_study_duration;
+DELETE FROM public.train_student_score;
+DELETE FROM public.train_score_item;
+DELETE FROM public.train_student_checkin;
+DELETE FROM public.train_lesson;
+DELETE FROM public.train_dorm_auth;
+DELETE FROM public.train_accommodation;
+DELETE FROM public.train_class_report;
+DELETE FROM public.train_enrollment;
+DELETE FROM public.train_plan_course;
+DELETE FROM public.train_class_plan;
+DELETE FROM public.train_course_resource;
+DELETE FROM public.train_resource;
+DELETE FROM public.train_electronic_board;
+DELETE FROM public.train_dormitory_info;
+DELETE FROM public.train_training_site;
+DELETE FROM public.train_classroom_info;
+DELETE FROM public.train_course;
+DELETE FROM public.train_student;
+DELETE FROM public.train_teacher WHERE t_id <> 'T001'; -- 保留基线教师 T001
+
+-- 2. 清理 Demo 用户关联
+DELETE FROM public.sys_user_role WHERE user_id IN (10, 11, 12, 21, 22);
+DELETE FROM public.sys_user WHERE user_id IN (10, 11, 12, 21, 22);
+
+COMMIT;
+
+-- 提示执行载入脚本
+\echo '>>> [RESET-CLEANED] 已清空演示业务表。请重新依序执行 001 到 004 脚本完成黄金数据注入。'