feat: OAuth 2.0 백엔드 시스템 구현 완료

Phase 1 & 2 완료:
- 프로젝트 기본 구조 설정
- Docker Compose 환경 구성 (MongoDB, Redis, Backend, Frontend)
- FastAPI 기반 OAuth 2.0 백엔드 구현

주요 기능:
- JWT 기반 인증 시스템
- 3단계 권한 체계 (System Admin/Group Admin/User)
- 사용자 관리 CRUD API
- 애플리케이션 관리 CRUD API
- OAuth 2.0 Authorization Code Flow
- Refresh Token 관리
- 인증 히스토리 추적

API 엔드포인트:
- /auth/* - 인증 관련 (register, login, logout, refresh)
- /users/* - 사용자 관리
- /applications/* - 애플리케이션 관리
- /oauth/* - OAuth 2.0 플로우

보안 기능:
- bcrypt 비밀번호 해싱
- JWT 토큰 인증
- CORS 설정
- Rate limiting 준비

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,114 @@
+version: '3.8'
+
+services:
+  # MongoDB Database
+  mongodb:
+    image: mongo:7.0
+    container_name: oauth-mongodb
+    restart: unless-stopped
+    ports:
+      - "27017:27017"
+    environment:
+      MONGO_INITDB_ROOT_USERNAME: admin
+      MONGO_INITDB_ROOT_PASSWORD: admin123
+      MONGO_INITDB_DATABASE: oauth_db
+    volumes:
+      - mongodb_data:/data/db
+      - mongodb_config:/data/configdb
+    networks:
+      - oauth-network
+    healthcheck:
+      test: echo 'db.runCommand("ping").ok' | mongosh localhost:27017/test --quiet
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 40s
+
+  # Redis Cache/Queue
+  redis:
+    image: redis:7-alpine
+    container_name: oauth-redis
+    restart: unless-stopped
+    ports:
+      - "6379:6379"
+    command: redis-server --appendonly yes
+    volumes:
+      - redis_data:/data
+    networks:
+      - oauth-network
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 30s
+
+  # OAuth Backend (FastAPI)
+  oauth-backend:
+    build:
+      context: ./oauth/backend
+      dockerfile: Dockerfile
+      target: development
+    container_name: oauth-backend
+    restart: unless-stopped
+    ports:
+      - "8000:8000"
+    environment:
+      - ENVIRONMENT=dev
+      - MONGODB_URL=mongodb://admin:admin123@mongodb:27017/oauth_db?authSource=admin
+      - REDIS_URL=redis://redis:6379
+      - SECRET_KEY=${SECRET_KEY:-3bf17c7f-5446-4a18-9cb3-f885eba501e8}
+      - DATABASE_NAME=oauth_db
+    volumes:
+      - ./oauth/backend:/app
+      - backend_logs:/var/log/oauth
+    networks:
+      - oauth-network
+    depends_on:
+      mongodb:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    command: uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload
+
+  # OAuth Frontend (React + Vite)
+  oauth-frontend:
+    build:
+      context: ./oauth/frontend
+      dockerfile: Dockerfile
+      target: development
+    container_name: oauth-frontend
+    restart: unless-stopped
+    ports:
+      - "5173:5173"
+    environment:
+      - VITE_API_URL=http://localhost:8000/api/v1
+      - VITE_ENV=dev
+    volumes:
+      - ./oauth/frontend:/app
+      - /app/node_modules
+    networks:
+      - oauth-network
+    depends_on:
+      oauth-backend:
+        condition: service_started
+    command: npm run dev -- --host 0.0.0.0
+
+networks:
+  oauth-network:
+    driver: bridge
+    name: oauth-network
+
+volumes:
+  mongodb_data:
+    driver: local
+    name: oauth-mongodb-data
+  mongodb_config:
+    driver: local
+    name: oauth-mongodb-config
+  redis_data:
+    driver: local
+    name: oauth-redis-data
+  backend_logs:
+    driver: local
+    name: oauth-backend-logs