feat: add integration tests for initialization flow

- Implemented end-to-end integration tests covering database reset, bootstrap admin creation, demo user provisioning, scenario installation, and general creation.
- Added support for deterministic seeding and auto admin general creation.
- Created a new package for integration tests with necessary configurations and scripts.
- Updated various modules to support new features, including admin user handling and scenario seeding.
- Enhanced error handling and validation in the join and orchestrator modules.

.env.ci.example

@@ -2,13 +2,16 @@ POSTGRES_DB=sammo_test
 POSTGRES_USER=sammo
 POSTGRES_PASSWORD=ci-postgres
 POSTGRES_SCHEMA=public
+GAME_TOKEN_SECRET=ci-secret
 REDIS_PASSWORD=ci-redis
 REDIS_HOST=127.0.0.1
 REDIS_PORT=16379
 REDIS_DB=0
-GAME_TOKEN_SECRET=ci-secret
+REDIS_URL=redis://:ci-redis@127.0.0.1:16379/0
 GATEWAY_REDIS_PREFIX=sammo:gateway
 GATEWAY_DB_SCHEMA=public
+GATEWAY_ADMIN_LOCAL_ACCOUNT_ENABLED=true
+GATEWAY_BOOTSTRAP_TOKEN=ci-bootstrap
 GATEWAY_API_HOST=127.0.0.1
 GATEWAY_API_PORT=13000
 GATEWAY_PUBLIC_URL=http://localhost:13000
@@ -16,5 +19,7 @@ GAME_API_HOST=127.0.0.1
 GAME_API_PORT=14000
 PROFILE=hwe
 SCENARIO=default
+INTEGRATION_WORLD_SEED=integration-seed
+INTEGRATION_JOIN_ALLOW_CITY=true
 KAKAO_REST_KEY=ci-kakao-rest-key
 KAKAO_REDIRECT_URI=http://localhost:13000/oauth/kakao/callback