Implement three divination modes, learn pages, and PM2 deploy on port 3130.

Add liuyao/bazi/combined flows with shared calc and AI infrastructure, 64-gua learn routes, and update Ubuntu PM2 deployment docs for port 3130.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/page-shell.tsx

@@ -0,0 +1,20 @@
+import Header from "@/components/header";
+import Footer from "@/components/footer";
+
+export default function PageShell({
+  children,
+  className = "",
+}: {
+  children: React.ReactNode;
+  className?: string;
+}) {
+  return (
+    <div className="flex min-h-screen flex-col">
+      <Header />
+      <div className={`mx-auto flex w-full flex-1 flex-col ${className}`}>
+        {children}
+      </div>
+      <Footer />
+    </div>
+  );
+}