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/lib/api.ts

@@ -0,0 +1,22 @@
+const API_BASE = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3001/api/v1';
+
+async function request<T>(path: string, options?: RequestInit): Promise<T> {
+  const res = await fetch(`${API_BASE}${path}`, {
+    headers: { 'Content-Type': 'application/json', ...options?.headers },
+    ...options,
+  });
+  if (!res.ok) {
+    const error = await res.json().catch(() => ({}));
+    throw new Error(error.message || `请求失败: ${res.status}`);
+  }
+  return res.json();
+}
+
+export const api = {
+  get: <T>(path: string) => request<T>(path),
+  post: <T>(path: string, data: unknown) =>
+    request<T>(path, { method: 'POST', body: JSON.stringify(data) }),
+  patch: <T>(path: string, data: unknown) =>
+    request<T>(path, { method: 'PATCH', body: JSON.stringify(data) }),
+  delete: <T>(path: string) => request<T>(path, { method: 'DELETE' }),
+};