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Initial commit: SB 백엔드 (Spring Boot + MyBatis)

- 사용자 CRUD REST API (/api/users)
- MariaDB(MyBatis) + Redis 캐싱 구성
- CORS 설정 및 헬스 체크 엔드포인트

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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src/main/resources/mapper/UserMapper.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.example.sb_bt.mapper.UserMapper">
+
+    <resultMap id="userResultMap" type="User">
+        <id property="id" column="id"/>
+        <result property="name" column="name"/>
+        <result property="email" column="email"/>
+        <result property="createdAt" column="created_at"/>
+    </resultMap>
+
+    <select id="findAll" resultMap="userResultMap">
+        SELECT id, name, email, created_at
+        FROM users
+        ORDER BY id DESC
+    </select>
+
+    <select id="findById" parameterType="long" resultMap="userResultMap">
+        SELECT id, name, email, created_at
+        FROM users
+        WHERE id = #{id}
+    </select>
+
+    <insert id="insert" parameterType="User" useGeneratedKeys="true" keyProperty="id">
+        INSERT INTO users (name, email, created_at)
+        VALUES (#{name}, #{email}, NOW())
+    </insert>
+
+    <update id="update" parameterType="User">
+        UPDATE users
+        SET name = #{name},
+            email = #{email}
+        WHERE id = #{id}
+    </update>
+
+    <delete id="delete" parameterType="long">
+        DELETE FROM users
+        WHERE id = #{id}
+    </delete>
+
+</mapper>