fix: repair Docker build — TS errors and missing docs in image

- Remove unused `httpx` import from bench.ts (package does not exist)
- Add explicit `IRouter` type on `router` in agent-outputs.ts and bench.ts
  to resolve TS2742 portable-type errors
- Remove `docs` from .dockerignore so Dockerfile.admin can copy it into
  the runner image (DOCS_ROOT=/app/docs is read at runtime by the admin)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.dockerignore

@@ -12,7 +12,6 @@
 **/.env
 **/.env.local
 **/*.log
-docs
 infra/docker/data
 **/__tests__
 **/*.test.ts