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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/application.yml

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+server:
+  port: 8080
+  servlet:
+    context-path: /
+
+spring:
+  application:
+    name: sb_bt
+
+  # ===== MariaDB =====
+  datasource:
+    driver-class-name: org.mariadb.jdbc.Driver
+    url: jdbc:mariadb://localhost:3306/sb_db?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Seoul
+    username: sb_user
+    password: sb_pass
+    hikari:
+      maximum-pool-size: 10
+      minimum-idle: 2
+      connection-timeout: 30000
+      pool-name: sbHikariPool
+
+  # ===== Redis =====
+  data:
+    redis:
+      host: localhost
+      port: 6379
+      password:
+      database: 0
+      timeout: 3000ms
+      lettuce:
+        pool:
+          max-active: 8
+          max-idle: 8
+          min-idle: 0
+
+# ===== MyBatis =====
+mybatis:
+  type-aliases-package: com.example.sb_bt.domain
+  mapper-locations: classpath:mapper/**/*.xml
+  configuration:
+    map-underscore-to-camel-case: true
+    jdbc-type-for-null: 'NULL'
+    default-fetch-size: 100
+    default-statement-timeout: 30
+
+# ===== Logging =====
+logging:
+  level:
+    root: INFO
+    com.example.sb_bt: DEBUG
+    com.example.sb_bt.mapper: DEBUG

src/main/resources/db/schema.sql

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+-- ============================================================
+-- sb_bt 초기 스키마 / 시드 데이터 (MariaDB)
+-- 사용법:
+--   1) MariaDB 접속 후 아래 DB/계정 생성 (관리자 권한)
+--   2) sb_db 선택 후 users 테이블 생성 및 시드 입력
+-- ============================================================
+
+-- 데이터베이스 및 계정 (최초 1회, root 등 관리자로 실행)
+CREATE DATABASE IF NOT EXISTS sb_db
+    DEFAULT CHARACTER SET utf8mb4
+    DEFAULT COLLATE utf8mb4_unicode_ci;
+
+CREATE USER IF NOT EXISTS 'sb_user'@'%' IDENTIFIED BY 'sb_pass';
+GRANT ALL PRIVILEGES ON sb_db.* TO 'sb_user'@'%';
+FLUSH PRIVILEGES;
+
+USE sb_db;
+
+-- 샘플 테이블
+CREATE TABLE IF NOT EXISTS users (
+    id          BIGINT       NOT NULL AUTO_INCREMENT,
+    name        VARCHAR(100) NOT NULL,
+    email       VARCHAR(255) NOT NULL,
+    created_at  DATETIME     NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    UNIQUE KEY uk_users_email (email)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- 시드 데이터
+INSERT INTO users (name, email) VALUES
+    ('홍길동', 'hong@example.com'),
+    ('김철수', 'kim@example.com'),
+    ('이영희', 'lee@example.com')
+ON DUPLICATE KEY UPDATE name = VALUES(name);

src/main/resources/mapper/UserMapper.xml

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+<?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>