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/components/product/RequirementStatusBadge.tsx

@@ -0,0 +1,16 @@
+'use client';
+
+import { RequirementStatus } from '@ftb/shared';
+import { REQUIREMENT_STATUS_LABEL, REQUIREMENT_STATUS_COLOR } from '@/lib/constants';
+
+interface Props {
+  status: RequirementStatus;
+}
+
+export function RequirementStatusBadge({ status }: Props) {
+  return (
+    <span className={`inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-medium ${REQUIREMENT_STATUS_COLOR[status]}`}>
+      {REQUIREMENT_STATUS_LABEL[status]}
+    </span>
+  );
+}