Summary

• Split large InkOS Studio API modules into focused route, service-config, agent, and test boundaries while preserving existing public APIs.
• Split major Studio UI surfaces including prompt input, chat page, sidebar, services console, book create/detail pages, and AI renderers.
• Add clearer lazy-loading boundaries for markdown renderers and keep Mermaid isolated behind content-triggered dynamic loading.

Test Plan

• git diff --check
• pnpm --filter @actalk/inkos-studio typecheck
• pnpm --filter @actalk/inkos-studio test
• pnpm --filter @actalk/inkos-studio build

Notes

• This is intended as a behavior-preserving refactor.
• HTTP routes, component public exports, and existing test semantics are preserved.
• The Mermaid vendor chunk is still large because of the third-party renderer, but it remains isolated as a lazy-loaded chunk.