feat(blog): add /blog routes with dedicated editorial layout

app/blog/layout.tsx

@@ -0,0 +1,16 @@
+import { Header } from '@/components/layout/Header'
+import { Footer } from '@/components/layout/Footer'
+import { ScrollProgress } from '@/components/ui/ScrollProgress'
+
+export default function BlogLayout({ children }: { children: React.ReactNode }) {
+  return (
+    <>
+      <ScrollProgress />
+      <Header />
+      <main className="mx-auto max-w-5xl px-6 py-12 sm:py-16">
+        {children}
+      </main>
+      <Footer />
+    </>
+  )
+}