Remove deprecated docker-compose.coolify.yml

Coolify uses docker-compose.yml directly, so the .coolify.yml variant
is redundant and causes confusion. Only docker-compose.yml is needed.

docker-compose.coolify.yml

@@ -1,39 +0,0 @@
-version: '3.8'
-
-services:
-  postgres:
-    image: postgres:15-alpine
-    restart: unless-stopped
-    environment:
-      POSTGRES_DB: recruitment
-      POSTGRES_USER: postgres
-      POSTGRES_PASSWORD: ${DB_PASSWORD:-changeme123}
-    volumes:
-      - postgres_data:/var/lib/postgresql/data
-      - ./migrations:/docker-entrypoint-initdb.d:ro
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U postgres"]
-      interval: 10s
-      timeout: 5s
-      retries: 5
-
-  app:
-    build: .
-    restart: unless-stopped
-    ports:
-      - "3000:3000"
-    environment:
-      NODE_ENV: production
-      PORT: 3000
-      DB_HOST: postgres
-      DB_PORT: 5432
-      DB_NAME: recruitment
-      DB_USER: postgres
-      DB_PASSWORD: ${DB_PASSWORD:-changeme123}
-      SESSION_SECRET: ${SESSION_SECRET:-change-this-secret-in-production}
-    depends_on:
-      postgres:
-        condition: service_healthy
-
-volumes:
-  postgres_data: