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/src/context.ts

@@ -1,6 +1,8 @@
 import type { GatewayFlushPublisher } from './auth/flushPublisher.js';
 import type { GatewaySessionService } from './auth/sessionService.js';
 import type { UserRepository } from './auth/userRepository.js';
+import type { KakaoOAuthClient } from './auth/kakaoClient.js';
+import type { OAuthSessionStore } from './auth/oauthSessionStore.js';
 
 export interface GatewayApiContext {
     users: UserRepository;
@@ -8,6 +10,9 @@ export interface GatewayApiContext {
     flushPublisher: GatewayFlushPublisher;
     gameTokenSecret: string;
     gameSessionTtlSeconds: number;
+    kakaoClient: KakaoOAuthClient;
+    oauthSessions: OAuthSessionStore;
+    publicBaseUrl: string;
 }
 
 export const createGatewayApiContext = (options: {
@@ -16,10 +21,16 @@ export const createGatewayApiContext = (options: {
     flushPublisher: GatewayFlushPublisher;
     gameTokenSecret: string;
     gameSessionTtlSeconds: number;
+    kakaoClient: KakaoOAuthClient;
+    oauthSessions: OAuthSessionStore;
+    publicBaseUrl: string;
 }): GatewayApiContext => ({
     users: options.users,
     sessions: options.sessions,
     flushPublisher: options.flushPublisher,
     gameTokenSecret: options.gameTokenSecret,
     gameSessionTtlSeconds: options.gameSessionTtlSeconds,
+    kakaoClient: options.kakaoClient,
+    oauthSessions: options.oauthSessions,
+    publicBaseUrl: options.publicBaseUrl,
 });