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/core/database.py

@@ -0,0 +1,38 @@
+from motor.motor_asyncio import AsyncIOMotorClient
+from app.core.config import settings
+import redis.asyncio as redis
+from typing import Optional
+
+class Database:
+    client: Optional[AsyncIOMotorClient] = None
+    database = None
+    redis_client: Optional[redis.Redis] = None
+
+db = Database()
+
+async def init_db():
+    db.client = AsyncIOMotorClient(settings.MONGODB_URL)
+    db.database = db.client[settings.DATABASE_NAME]
+    db.redis_client = await redis.from_url(settings.REDIS_URL, decode_responses=True)
+    
+    await create_indexes()
+
+async def close_db():
+    if db.client:
+        db.client.close()
+    if db.redis_client:
+        await db.redis_client.close()
+
+async def create_indexes():
+    await db.database.users.create_index("email", unique=True)
+    await db.database.users.create_index("username", unique=True)
+    await db.database.applications.create_index("client_id", unique=True)
+    await db.database.applications.create_index("app_name", unique=True)
+    await db.database.auth_history.create_index([("user_id", 1), ("created_at", -1)])
+    await db.database.auth_history.create_index("created_at")
+
+def get_database():
+    return db.database
+
+def get_redis():
+    return db.redis_client