feat: integrate Kakao OAuth for user authentication and enhance user repository

- Added Kakao OAuth client implementation for handling authentication flows.
- Updated user repository to support OAuth-based user creation and retrieval.
- Introduced Redis-based session management for OAuth sessions.
- Enhanced in-memory user repository to handle OAuth user data.
- Updated environment configuration files to include new OAuth settings.
- Modified API routes to support Kakao login and registration flows.
- Added Prisma schema updates for user model to accommodate OAuth fields.
- Implemented tests for the new authentication flow and user repository methods.

app/gateway-api/package.json

@@ -17,6 +17,7 @@
     },
     "dependencies": {
         "@fastify/cors": "^10.0.1",
+        "@prisma/client": "^7.2.0",
         "@sammo-ts/common": "workspace:*",
         "@sammo-ts/infra": "workspace:*",
         "@trpc/server": "^11.4.4",