Covers: config merging (3-layer), Traefik label generation (path + subdomain routing), network topology (infra/traefik/env isolation), replica management, blue/green and rolling deployment strategies, Docker event stream monitoring, deployment status state machine (DEGRADED/STOPPING states), pre-flight checks, and UI changes. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>