chore: unify README under Smoo AI brand and voice

[brentrager]

Rewrites the README with the standard Smoo AI branded header (logo, tagline, flat-square brand-color badges), the "Part of Smoo AI" section, and the footer line, in the shared brand voice. All real technical content is preserved verbatim — the CLI-moved notice, SDK matrix, TypeScript quick start, Next.js/Vite integration, the full .getSync() bundling guide, container/runtime mode, config tiers, B2M key restrictions, multi-language snippets, env-var table, and license. Restructured and rephrased only.

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