feat(website): apply Crystal Lattice brand — fonts, palette, hero copy

- Swap Inter/Cormorant Garamond/Geist → Neue Machina/Satoshi/Onest (all free/web)
- Align color palette to Crystal Lattice decision (0002): void #080C18, cyan-vivid #38BDF8, ice #DBE7F5
- Update hero: "Memory *is* identity." with italic blue "is", white "identity"
- New hero subtext: "Every conversation, every idea, every small decision… held somewhere safe."
- JetBrains Mono unchanged (already OFL)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

website/.vitepress/config.mts

@@ -21,9 +21,11 @@ export default withMermaid(
 
     head: [
       ['link', { rel: 'icon', href: `${docsBase}mempalace_logo.png` }],
+      ['link', { rel: 'preconnect', href: 'https://api.fontshare.com' }],
+      ['link', { href: 'https://api.fontshare.com/v2/css?f[]=neue-machina@300,400,500,700,800&f[]=satoshi@300,400,500,700&display=swap', rel: 'stylesheet' }],
       ['link', { rel: 'preconnect', href: 'https://fonts.googleapis.com' }],
       ['link', { rel: 'preconnect', href: 'https://fonts.gstatic.com', crossorigin: '' }],
-      ['link', { href: 'https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@300;400;500&family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400&family=Geist:wght@300;400;500;600&display=swap', rel: 'stylesheet' }],
+      ['link', { href: 'https://fonts.googleapis.com/css2?family=Onest:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap', rel: 'stylesheet' }],
       ['meta', { property: 'og:title', content: 'MemPalace — AI Memory System' }],
       ['meta', { property: 'og:description', content: '96.6% LongMemEval recall. Zero API calls. Local, free, open source.' }],
       ['meta', { property: 'og:image', content: `${docsBase}mempalace_logo.png` }],