[Docs] Update README, architecture diagrams, website, and keynote slides

[samzong]

Summary

Comprehensive documentation refresh: rewrite README with product-focused language and new features, add architecture SVG diagrams (dark + light), integrate architecture section into the website, and update keynote slides with new content and layout fixes.

Type of change

• [Docs] documentation-only change

Why is this needed?

README was outdated — missing cron scheduling, notifications, agent management, auto-extract, auto-update, and other shipped features. Architecture was shown as ASCII art. Website had no architecture section. Keynote slides had image overflow issues and outdated version references.

What changed?

• README.md: Rewritten with product-focused language, updated features list, new "What it stores" / "Repo layout" / "Tech stack" / "Platform notes" sections, updated roadmap (v0.0.10), architecture SVG replacing ASCII diagram
• docs/architecture.svg + docs/architecture-light.svg: New product-showcase SVG diagrams with three-panel app wireframe, multi-gateway visualization, vector logo, dark and light variants
• website/src/components/Architecture.tsx: New Architecture section between Features and QuickStart
• website/src/components/Header.tsx: Added "Architecture" nav link
• website/src/i18n/en.ts + zh.ts: Added architecture translations and nav key
• website/src/App.tsx: Integrated Architecture component
• website/public/: Copied both SVG variants
• keynote/slides.md: Updated architecture slide (left-right layout), added About Me slide, updated Current Status to v0.0.10, added GitHub card CTA, replaced release history, fixed image overflow on all screenshot slides
• keynote/public/images/architecture.svg: Copied dark SVG
• package.json: Added pnpm dev:website script

Architecture impact

• Owning layer: shared (none) / main (none) / preload (none) / renderer (none)
• Cross-layer impact: none — documentation and website only
• Invariants touched from docs/architecture-invariants.md: none
• Why those invariants remain protected: no code changes to desktop app

Linked issues

N/A

Validation

• pnpm lint
• pnpm test
• pnpm build
• Manual smoke test
• Not run

Commands, screenshots, or notes:

Lint and architecture check passed via pre-commit hook.
Website typecheck passed: pnpm --filter @clawwork/website exec tsc --noEmit

Screenshots or recordings

Architecture diagram (dark):

Release note

• No user-facing change. Release note is NONE.

NONE

Checklist

• The PR title uses at least one approved prefix: [Docs]
• The summary explains both what changed and why
• Validation reflects the commands actually run for this PR
• Architecture impact is described and references any touched invariants
• Cross-layer changes are explicitly justified
• The release note block is accurate

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