refactor: reorganize monorepo into apps/ and packages/ directories
Move server applications (appview, web) into apps/ and keep shared
libraries (lexicon, spike) in packages/. Update pnpm workspace config,
documentation (CLAUDE.md, README.md, project plan, schema design doc)
to reflect the new structure.
https://claude.ai/code/session_014iuD1gNMNFLYgouQ5RhkJX