init: CasSsoService CAS 5.3 overlay (cas.war via LFS)

docker/init.sql

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+-- CAS 专用 MySQL 初始化（仅首次启动执行一次）
+-- 库/用户由容器环境变量 MYSQL_DATABASE / MYSQL_USER / MYSQL_PASSWORD 创建，这里只建表与种子数据
+
+CREATE DATABASE IF NOT EXISTS cas CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+USE cas;
+
+CREATE TABLE IF NOT EXISTS sys_user (
+  id       BIGINT AUTO_INCREMENT PRIMARY KEY,
+  username VARCHAR(64)  NOT NULL,
+  password VARCHAR(100) NOT NULL,
+  disabled TINYINT(1)   DEFAULT 0,
+  expired  TINYINT(1)   DEFAULT 0,
+  UNIQUE KEY uk_username (username)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- 默认管理员：admin / admin123 （BCrypt，前缀 $2a$ 与 Spring Security 兼容）
+INSERT INTO sys_user(username, password, disabled, expired) VALUES
+('admin', '$2a$10$kRc0qMMC9NGbE.46fEWZvOlpcy.pjKef2ZA9yoFdKFfBw.nEJEUZO', 0, 0)
+ON DUPLICATE KEY UPDATE password = VALUES(password);