Add AUTH_TRUST_HOST environment variable for Docker

- Set AUTH_TRUST_HOST=true in .env and docker-compose.yml
- Ensures NextAuth trusts all hosts in Docker environment
- Fixes UntrustedHost error

.env

@@ -4,6 +4,7 @@ DATABASE_URL="mysql://lists_app:ListsApp@2025!@192.168.4.20:3306/ultimate_lists"
 NEXTAUTH_URL=http://localhost:3500
 NEXTAUTH_SECRET=your-secret-key-here-please-change-in-production
 AUTH_SECRET=your-secret-key-here-please-change-in-production
+AUTH_TRUST_HOST=true
 
 # Database connection check (for docker-compose health check)
 DB_HOST=192.168.4.20

docker-compose.yml

@@ -11,6 +11,7 @@ services:
       - NEXTAUTH_URL=${NEXTAUTH_URL:-http://localhost:3500}
       - NEXTAUTH_SECRET=${NEXTAUTH_SECRET}
       - AUTH_SECRET=${AUTH_SECRET}
+      - AUTH_TRUST_HOST=true
     restart: unless-stopped
     depends_on:
       - db-check