Add WhyRating Templates - brand identity system

Next.js app showcasing WhyRating brand guidelines with interactive
tabs for colors, typography, proportions, logos, voice, downloads,
and AI context. Includes email templates (headers, signatures, CTAs)
and presentation component.

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

whyrating-templates/public/next.svg

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