feat(web): "what is claudemesh?" explainer + architecture diagram

Fixes the "chatbot integration" misread of the landing page by framing
claudemesh as a mesh-not-a-bridge above the gateways section.

- Mental shift (before/after): one Claude per project → mesh of Claudes,
  mesh-as-substrate with surfaces tapping in
- Three concrete use cases with honest limits: solo multi-machine,
  cross-repo team (Alice's Stripe fix / Bob rediscovers), mobile 3am
  oversight via WhatsApp gateway
- Inline SVG architecture diagram: broker at center ("routes only · never
  decrypts"), six peers hexagon-orbiting with ciphertext edges
- Anti-framing "what claudemesh is NOT" list to kill misreads
- Italic pull-quote closer with the honest one-liner

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

apps/web/src/app/[locale]/(marketing)/page.tsx

@@ -5,6 +5,7 @@ import { LaptopToLaptop } from "~/modules/marketing/home/laptop-to-laptop";
 import { Features } from "~/modules/marketing/home/features";
 import { MeetsYou } from "~/modules/marketing/home/meets-you";
 import { BeyondTerminal } from "~/modules/marketing/home/beyond-terminal";
+import { WhatIsClaudemesh } from "~/modules/marketing/home/what-is-claudemesh";
 import { FAQ } from "~/modules/marketing/home/faq";
 import { CallToAction } from "~/modules/marketing/home/cta";
 import { LatestNewsToaster } from "~/modules/marketing/home/toaster";
@@ -21,6 +22,7 @@ const HomePage = () => {
       <LaptopToLaptop />
       <Features />
       <MeetsYou />
+      <WhatIsClaudemesh />
       <BeyondTerminal />
       <FAQ />
       <CallToAction />