Closes #1299

Summary

This fixes nuxt typecheck for consumer apps that use extends: ['docus'] and enable the same Docus feature surface exercised by a real app.

The verified scope is still narrow:

• package-internal type cleanup only
• no runtime behavior changes
• no attempt to solve broader Docus layer/embed issues

StackBlitz

Both repros now mirror the packaged-consumer failure more closely:

• they extend Docus
• define a small assistant app config
• enable the same Nuxt/Docus feature surface that exposed the remaining consumer-package errors

CLI Reproduction

git clone --depth 1 --filter=blob:none --sparse https://github.com/onmax/repros.git
cd repros && git sparse-checkout set docus-1299
cd docus-1299 && pnpm i && pnpm typecheck

Verify Fix

cd .. && git sparse-checkout set docus-1299 docus-1299-fix
cd docus-1299-fix && pnpm i && pnpm typecheck

The -fix folder uses pnpm patch to apply the fix locally.

Real App Verification

I also verified this patch against the Nimiq developer center by consuming the forked package branch directly, with no local pnpm patch entry:

• dependency: github:onmax/docus#dist/typecheck-consumer-app
• pnpm install succeeds
• pnpm typecheck succeeds
• pnpm build succeeds

Related

• #1282 shows separate route/injection issues when embedding Docus under /docs
• #1290 shows separate dependency/setup friction around layer usage

This PR only addresses the consumer nuxt typecheck failures reproduced in #1299.