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/main.py

@@ -0,0 +1,38 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from contextlib import asynccontextmanager
+from app.core.config import settings
+from app.core.database import init_db, close_db
+from app.api.v1.router import api_router
+import logging
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    await init_db()
+    logger.info("Database initialized")
+    yield
+    await close_db()
+    logger.info("Database connection closed")
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    version=settings.VERSION,
+    lifespan=lifespan
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.BACKEND_CORS_ORIGINS,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+@app.get("/health")
+async def health_check():
+    return {"status": "healthy", "service": "OAuth Authentication System"}