feat(configuration): 환경변수 DB 저장 기능 구현 (#36)

[1210thatman]

Summary

• 환경변수를 MySQL DB에 저장하고 중앙에서 관리하는 Configuration 서비스 구현
• 헥사고날 아키텍처(Domain / Application / Adapter-in / Adapter-out) 패턴 적용
• 다른 MSA 서비스가 gRPC를 통해 환경변수를 조회할 수 있는 엔드포인트 노출

Related Issue

• Closes 환경변수 DB 저장 기능 구현 #36

Change Type

• New feature

Changes

레이어	파일	설명
contracts	configuration.proto	gRPC 서비스/메시지 정의
domain	EnvironmentVariable.kt, Port interfaces, Commands, Exceptions	도메인 모델 및 포트
application	EnvironmentVariableService.kt	CRUD 유즈케이스 구현
adapter-out	EnvironmentVariableJpaEntity, JpaRepository, PersistenceAdapter	MySQL JPA 영속성
adapter-in	ConfigurationGrpcService, ConfigurationGrpcServer	gRPC 서버 (5개 RPC)
bootstrap	application.yaml	MySQL/gRPC 포트 설정

gRPC API

RPC	설명
CreateEnvironmentVariable	새 환경변수 등록
GetEnvironmentVariable	key로 단건 조회
GetAllEnvironmentVariables	전체 조회
UpdateEnvironmentVariable	기존 환경변수 수정
DeleteEnvironmentVariable	환경변수 삭제

Follow-up Tasks

이 PR 머지 후 아래 후속 작업이 필요합니다.

• DB 테이블 생성: configuration_db 스키마 및 environment_variable 테이블 생성 (현재 ddl-auto: validate 설정으로 앱 실행 전 수동 생성 필요)

  CREATE DATABASE IF NOT EXISTS configuration_db;
  USE configuration_db;
  CREATE TABLE environment_variable (
      id BIGINT AUTO_INCREMENT PRIMARY KEY,
      env_key VARCHAR(255) NOT NULL UNIQUE,
      env_value TEXT NOT NULL,
      description TEXT
  );

• 환경변수 주입 설정: DB_USERNAME, DB_PASSWORD, GRPC_PORT 환경변수 인프라 설정
• 다른 서비스 연동: 타 MSA 서비스에서 gRPC 클라이언트 스텁 연결

Review Focus

• 헥사고날 아키텍처 레이어 경계 준수 여부
• gRPC 서버 SmartLifecycle 기반 생명주기 관리 방식
• 트랜잭션 경계 (Application 레이어에서 관리)

Checklist

• 기존 아키텍처 패턴(헥사고날) 준수
• 기존 Bazel 빌드 컨벤션 준수
• 커밋 컨벤션 준수
• DB 테이블 생성 (후속 작업)
• 인프라 환경변수 설정 (후속 작업)

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