Add Docker Compose stack for L2 Essence 542 with PostgreSQL 17 and install scripts.

docker-compose.yml

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+# Lineage 2 Essence 542 (Samurai Crow) — локальная среда
+# Замените сервис l2-server на свой образ/сборку, когда будет готов Dockerfile.
+
+services:
+  postgres:
+    image: postgres:17-alpine
+    container_name: l2_postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:-l2user}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD in .env}
+      POSTGRES_DB: ${POSTGRES_DB:-l2essence}
+      PGDATA: /var/lib/postgresql/data/pgdata
+    ports:
+      - "${POSTGRES_PORT:-5432}:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./docker/initdb:/docker-entrypoint-initdb.d:ro
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-l2user} -d ${POSTGRES_DB:-l2essence}"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  # Заглушка: подключите свой сервер (Auth/Game) или замените build: на реальный Dockerfile.
+  l2-server:
+    image: ${L2_SERVER_IMAGE:-ubuntu:24.04}
+    container_name: l2_server_placeholder
+    restart: "no"
+    depends_on:
+      postgres:
+        condition: service_healthy
+    environment:
+      DATABASE_URL: postgresql://${POSTGRES_USER:-l2user}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB:-l2essence}
+    # Раскомментируйте при готовности бинарей/скриптов:
+    # volumes:
+    #   - ./server:/opt/l2server:ro
+    # command: ["/opt/l2server/start.sh"]
+    command: ["bash", "-lc", "echo 'L2 server placeholder: замените сервис l2-server в docker-compose.yml'; sleep infinity"]
+    profiles:
+      - placeholder
+
+volumes:
+  postgres_data: