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>

app/page.tsx

@@ -1,13 +1,58 @@
-import Header from "@/components/header";
-import Divination from "@/components/divination";
-import Footer from "@/components/footer";
+import Link from "next/link";
+import PageShell from "@/components/page-shell";
+import { BookOpen, BrainCircuit, Compass, Sparkles } from "lucide-react";
+
+const MODULES = [
+  {
+    href: "/learn",
+    title: "易经学习",
+    description: "64 卦原文阅读，繁体精简版与简体图文版",
+    icon: BookOpen,
+  },
+  {
+    href: "/liuyao",
+    title: "六爻算卦",
+    description: "三钱法起卦，结合卦辞 AI 智能解读",
+    icon: Sparkles,
+  },
+  {
+    href: "/bazi",
+    title: "生辰八字",
+    description: "四柱排盘，十神大运流年，AI 命理解读",
+    icon: BrainCircuit,
+  },
+  {
+    href: "/combined",
+    title: "综合测算",
+    description: "天时地利人和融合分析，六爻可选",
+    icon: Compass,
+  },
+];
 
 export default function Home() {
   return (
-    <>
-      <Header />
-      <Divination />
-      <Footer />
-    </>
+    <PageShell className="max-w-2xl px-4 py-8">
+      <div className="mb-8 text-center">
+        <h1 className="text-2xl font-bold tracking-tight">知命阁</h1>
+        <p className="mt-2 text-muted-foreground">
+          融合周易智慧与人工智能
+        </p>
+      </div>
+      <div className="grid gap-4 sm:grid-cols-2">
+        {MODULES.map(({ href, title, description, icon: Icon }) => (
+          <Link
+            key={href}
+            href={href}
+            className="group rounded-lg border bg-card p-5 shadow-sm transition-colors hover:border-primary/40 hover:bg-accent/30"
+          >
+            <div className="mb-3 flex items-center gap-2">
+              <Icon size={20} className="text-primary" />
+              <span className="font-medium">{title}</span>
+            </div>
+            <p className="text-sm text-muted-foreground">{description}</p>
+          </Link>
+        ))}
+      </div>
+    </PageShell>
   );
 }