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

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