fix: SEO canonical URLs, LCP performance, remove unused dependencies

- Remove duplicate app/projects/ route (was causing 5xx and soft 404)
- Fix nginx: redirect www.dk0.dev → dk0.dev (non-www canonical)
- Fix not-found.tsx: locale-prefixed links, remove framer-motion dependency
- Add fetchPriority='high' and will-change to Hero LCP image
- Add preconnect hints for hardcover.app and cms.dk0.dev
- Reduce background blur from 100px to 80px (LCP rendering delay)
- Remove boneyard-js (~20 KiB), replace with custom Skeleton component
- Remove react-icons (~10 KiB), replace with inline SVGs
- Conditionally render mobile menu (saves ~20 DOM nodes)
- Add /books to sitemap
- Optimize image config with explicit deviceSizes/imageSizes

app/components/ClientProviders.tsx

@@ -7,7 +7,6 @@ import { ToastProvider } from "@/components/Toast";
 import ErrorBoundary from "@/components/ErrorBoundary";
 import { ConsentProvider } from "./ConsentProvider";
 import { ThemeProvider } from "./ThemeProvider";
-import "../../bones/registry";
 
 const BackgroundBlobs = dynamic(
   () => import("@/components/BackgroundBlobs").catch(() => ({ default: () => null })),