feat(frontend): 全局企业筛选同步 — 各页面显示企业名标签

- 新增 useCompanyName hook 和 CompanyNameTag 组件
- 20+ investor 页面添加 CompanyNameTag 显示企业名
- 表格型页面（agents/agreements/board/weak-signals/talents/reports）新增企业列
- 卡片型页面（risks/synergies/sentinels/alpha/exit-signals/okrs/aars/events/tasks/pre-mortems/nudges/product-diagnostics/peer-circles）添加企业名标签
- customer-success 改用 CompanyNameTag 替代手动 company_name 显示
- PlanCard 组件添加企业名标签
- 编译验证通过

frontend/src/app/(investor)/agreements/page.tsx

@@ -2,6 +2,7 @@
 
 import { useState } from "react";
 import { useScopeEffect } from "@/lib/company-scope";
+import { CompanyNameTag } from "@/components/shared/CompanyNameTag";
 import {Plus } from "lucide-react";
 import { listAgreements } from "@/lib/api-v2";
 import { PageContainer, Badge, TableEmpty } from "@/components/shared/PageContainer";
@@ -10,6 +11,7 @@ import { EmptyState } from "@/components/shared/EmptyState";
 
 /** 投资协议项。 */
 interface Agreement {
+  company_id?: string;
   title: string;
   signed_at: string;
   status: string;
@@ -46,6 +48,7 @@ export default function AgreementsPage() {
           <table className="min-w-full divide-y divide-gray-200 text-sm">
             <thead className="bg-gray-50">
               <tr>
+                <th className="px-4 py-2 text-left font-medium text-gray-500">企业</th>
                 <th className="px-4 py-2 text-left font-medium text-gray-500">协议名称</th>
                 <th className="px-4 py-2 text-left font-medium text-gray-500">签署日期</th>
                 <th className="px-4 py-2 text-left font-medium text-gray-500">状态</th>
@@ -54,10 +57,11 @@ export default function AgreementsPage() {
             </thead>
             <tbody className="divide-y divide-gray-100 bg-white">
               {items.length === 0 ? (
-                <TableEmpty colSpan={4} />
+                <TableEmpty colSpan={5} />
               ) : (
                 items.map((item, i) => (
                   <tr key={i}>
+                    <td className="px-4 py-2"><CompanyNameTag companyId={item.company_id} /></td>
                     <td className="px-4 py-2 text-gray-900">{item.title}</td>
                     <td className="px-4 py-2 text-gray-600">{item.signed_at}</td>
                     <td className="px-4 py-2">