feat(product): 实现产品需求管理模块（后端 + 前端）

后端：Product Module（CRUD）、Requirement Module（CRUD + 状态机流转）、PrismaService
前端：产品列表页、产品详情页（含需求池 Tab）、Zustand Store、API 封装

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/app/products/page.tsx

@@ -0,0 +1,59 @@
+'use client';
+
+import { useEffect, useState } from 'react';
+import { useRouter } from 'next/navigation';
+import { useProductStore } from '@/stores/useProductStore';
+import { ProductCard } from '@/components/product/ProductCard';
+import { ProductForm } from '@/components/product/ProductForm';
+
+export default function ProductsPage() {
+  const router = useRouter();
+  const { products, loading, fetchProducts, createProduct } = useProductStore();
+  const [showForm, setShowForm] = useState(false);
+
+  useEffect(() => {
+    fetchProducts();
+  }, [fetchProducts]);
+
+  const handleCreate = async (data: { name: string; description: string }) => {
+    await createProduct(data);
+    setShowForm(false);
+  };
+
+  return (
+    <div className="mx-auto max-w-6xl px-6 py-8">
+      <div className="mb-6 flex items-center justify-between">
+        <h1 className="text-2xl font-bold text-gray-900">产品列表</h1>
+        <button
+          onClick={() => setShowForm(true)}
+          className="rounded-md bg-blue-600 px-4 py-2 text-sm text-white hover:bg-blue-700"
+        >
+          新建产品
+        </button>
+      </div>
+
+      {showForm && (
+        <div className="mb-6 rounded-lg border border-gray-200 p-6">
+          <h2 className="mb-4 text-lg font-medium">新建产品</h2>
+          <ProductForm onSubmit={handleCreate} onCancel={() => setShowForm(false)} />
+        </div>
+      )}
+
+      {loading ? (
+        <div className="py-12 text-center text-gray-400">加载中...</div>
+      ) : products.length === 0 ? (
+        <div className="py-12 text-center text-gray-400">暂无产品，点击上方按钮创建</div>
+      ) : (
+        <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-3">
+          {products.map((product) => (
+            <ProductCard
+              key={product.id}
+              product={product}
+              onClick={(id) => router.push(`/products/${id}`)}
+            />
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}