chore: unify README under Smoo AI brand and voice

[brentrager]

Rewrites the README to the unified Smoo AI brand spec: centered logo hero, flat-square brand-color badges (teal/orange/red/navy), standard section order (Features / Install / Usage / Architecture / Part of Smoo AI / Contributing / License), and the "AI built into every product" footer.

All real technical content is preserved — the full capture feature matrix (browser/Node/React/Next), the "what does NOT get captured" list, all four Quick Start code blocks, the package table, multi-language ingest contract, the architecture diagram, built-with, privacy, and status sections, plus the MIT license and maintainer contacts. Restructured and rephrased only.

No docs/ Obsidian vault in this repo (the only docs are the rust/ crate README) — n/a.

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