Initial commit: OAuth 2.0 인증 시스템 with APISIX API Gateway

- FastAPI 백엔드 + MongoDB + Redis 구성
- React + Vite + TypeScript + shadcn/ui 프론트엔드
- Apache APISIX API Gateway 통합
- Docker Compose 기반 개발 환경
- 3단계 권한 체계 (System Admin, Group Admin, User)
- 동적 테마 지원
- 환경별 설정 (dev/vei/prod)

🤖 Generated with Claude Code

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

oauth/backend/app/api/v1/router.py

@@ -0,0 +1,9 @@
+from fastapi import APIRouter
+from app.api.v1.endpoints import auth, users, applications, admin
+
+api_router = APIRouter()
+
+api_router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+api_router.include_router(users.router, prefix="/users", tags=["users"])
+api_router.include_router(applications.router, prefix="/applications", tags=["applications"])
+api_router.include_router(admin.router, prefix="/admin", tags=["admin"])