Integrate Reo tracking for docs and CLI

[zahlekhan]

Summary

• rebase the branch onto the latest thesysdev/openui:main
• initialize the Reo browser beacon from the docs site's existing client provider when NEXT_PUBLIC_REO_CLIENT_ID is configured
• add reo-census to the CLI npm package, using Reo's default enabled install tracking
• bump @openuidev/cli from 0.2.3 to 0.2.4
• document the separate install-time opt-out: PACKAGE_TRACKER_ANALYTICS=false npm install @openuidev/cli

Why

Capture configured docs usage and npm install activity, with an explicit install-time opt-out that remains separate from command telemetry.

Validation

• pnpm --filter @openuidev/docs types:check
• pnpm --filter @openuidev/cli run ci
• pnpm --filter @openuidev/cli pack (verified @openuidev/cli@0.2.4)
• verified the reo-census default-enabled and PACKAGE_TRACKER_ANALYTICS=false paths without network access
• pnpm install --lockfile-only --frozen-lockfile --offline --ignore-scripts