refactor: flatten monorepo to single web package (#12)

Flatten the pnpm monorepo (apps/web + packages/*) into a single web package at the repo root.

- Move app/lib/components/scripts/public to root; drop apps/web and packages/* wrappers
- Rewrite tsconfig paths (@infiplot/*) to ./lib/*; turbopack.root = __dirname
- Update Vercel (no root-directory) and Cloudflare (pnpm build:cf at root) deploy paths
- Regenerate pnpm-lock.yaml to drop stale workspace importers
- Bump engines.node to >=22 to match wrangler

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

next.config.ts

@@ -0,0 +1,11 @@
+import type { NextConfig } from "next";
+
+const config: NextConfig = {
+  reactStrictMode: true,
+  typedRoutes: false,
+  turbopack: {
+    root: __dirname,
+  },
+};
+
+export default config;