Migrate from Vercel to Cloudflare Pages, fix distill command symbol

Replace Vercel serverless functions with Cloudflare Pages static
rewrites and lightweight download functions. Pre-generate all API
JSON data at build time for zero-invocation static serving. Also
fix stale simplify→distill rename in framework-viz periodic table.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

functions/api/download/bundle/[provider].js

@@ -0,0 +1,29 @@
+const ALLOWED_PROVIDERS = ['universal', 'universal-prefixed'];
+
+export async function onRequestGet(context) {
+	const { provider } = context.params;
+
+	if (!provider || !ALLOWED_PROVIDERS.includes(provider)) {
+		return Response.json({ error: "Invalid provider" }, { status: 400 });
+	}
+
+	const url = new URL(context.request.url);
+	url.pathname = `/_data/dist/${provider}.zip`;
+
+	const response = await context.env.ASSETS.fetch(url);
+
+	if (!response.ok) {
+		return Response.json({ error: "Bundle not found" }, { status: 404 });
+	}
+
+	const content = await response.arrayBuffer();
+	const safeProvider = provider.replace(/[^a-zA-Z0-9._-]/g, '');
+
+	return new Response(content, {
+		headers: {
+			'Content-Type': 'application/zip',
+			'Content-Disposition': `attachment; filename="impeccable-style-${safeProvider}.zip"`,
+			'Cache-Control': 'public, s-maxage=86400, stale-while-revalidate=3600',
+		}
+	});
+}