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/auth/userRepository.ts

@@ -4,6 +4,10 @@ export interface UserRecord {
     displayName: string;
     roles: string[];
     sanctions: UserSanctions;
+    oauthType: 'NONE' | 'KAKAO';
+    oauthId?: string;
+    email?: string;
+    oauthInfo?: UserOAuthInfo;
     passwordHash: string;
     passwordSalt: string;
     createdAt: string;
@@ -38,10 +42,28 @@ export interface CreateUserInput {
     username: string;
     password: string;
     displayName?: string;
+    oauth?: {
+        type: 'KAKAO';
+        id: string;
+        email: string;
+        info: UserOAuthInfo;
+    };
 }
 
 export interface UserRepository {
     findByUsername(username: string): Promise<UserRecord | null>;
+    findByOauthId(type: 'KAKAO', oauthId: string): Promise<UserRecord | null>;
+    findByEmail(email: string): Promise<UserRecord | null>;
     createUser(input: CreateUserInput): Promise<UserRecord>;
     verifyPassword(user: UserRecord, password: string): Promise<boolean>;
+    updatePassword(userId: string, password: string): Promise<void>;
+    updateOAuthInfo(userId: string, oauthInfo: UserOAuthInfo): Promise<void>;
+}
+
+export interface UserOAuthInfo {
+    accessToken?: string;
+    refreshToken?: string;
+    accessTokenValidUntil?: string;
+    refreshTokenValidUntil?: string;
+    nextPasswordChange?: string;
 }