- Use cases (get-page-by-slug, get-site-settings) → factory functions with I*UseCase aliases - Controllers split: pages.controller.ts → 2 single-responsibility files - DI module wires factories with .toDynamicValue() - tRPC router resolves controllers via container Refactor log: §2, §3, §4.1, §4.2, §5.1 Spec: §6.3 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>