chore: glow up README + diagrams — hero banner, marketing callout

[brentrager]

Applies the Smoo AI README glow-up (v2) to @smooai/deploy.

What changed

• Hero banner — replaced the logo + H1 + tagline block with a gradient .github/banner.png (Smoo family mark, name, tagline, kicker). SVG source kept alongside.
• Badges — the 3 primary badges (Smoo AI platform, license, hosted) are now for-the-badge + labelColor=020618; language/CI badges stay flat-square.
• Marketing callout — Part of Smoo AI now leads with smoo.ai/open-source and links sibling repos.
• Diagrams (2) — both mermaid blocks simplified (fewer nodes, short labels, single direction) and brand-themed with the dark init directive + warm/teal classDefs. Architecture diagram collapsed the per-store fan-out into one teal store node and went LR; the verify pyramid flows bottom-up with teal base / warm apex.

All real content (constructs reference, args table, Helm notes, S3 Vectors caveat, license) preserved.

🤖 Generated with Claude Code

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