迁移：将DB变更记录SQL文件移动到sql目录下

sql/迁移记录-DB变更记录/2025-12-30 add_table_sys_notice_read.sql

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+-- 公告/通知已读记录表
+CREATE TABLE IF NOT EXISTS sys_notice_read (
+    read_id BIGINT PRIMARY KEY,
+    notice_id BIGINT NOT NULL,
+    user_id BIGINT NOT NULL,
+    read_time TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT uk_notice_user UNIQUE (notice_id, user_id)
+);
+
+COMMENT ON TABLE sys_notice_read IS '公告/通知已读记录表';
+COMMENT ON COLUMN sys_notice_read.read_id IS '阅读ID';
+COMMENT ON COLUMN sys_notice_read.notice_id IS '公告/通知ID';
+COMMENT ON COLUMN sys_notice_read.user_id IS '用户ID';
+COMMENT ON COLUMN sys_notice_read.read_time IS '阅读时间';
+
+-- 创建序列
+CREATE SEQUENCE IF NOT EXISTS sys_notice_read_read_id_seq
+INCREMENT 1
+MINVALUE 1
+MAXVALUE 99999999
+START 200
+CACHE 1;
+
+-- 索引
+CREATE INDEX IF NOT EXISTS idx_notice_read_notice_id ON sys_notice_read(notice_id);
+CREATE INDEX IF NOT EXISTS idx_notice_read_user_id ON sys_notice_read(user_id);