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)/customer-success/page.tsx

@@ -2,6 +2,7 @@
 
 import { useState } from "react";
 import { useScopeEffect } from "@/lib/company-scope";
+import { CompanyNameTag } from "@/components/shared/CompanyNameTag";
 import { apiFetch } from "@/lib/api";
 import { LoadingSpinner } from "@/components/shared/LoadingSpinner";
 import { EmptyState } from "@/components/shared/EmptyState";
@@ -191,7 +192,7 @@ export default function CustomerSuccessPage() {
             {churnRisks.map((risk, i) => (
               <div key={i} className="flex items-center justify-between rounded-md border border-[var(--border)] px-3 py-2">
                 <div>
-                  <span className="text-sm font-medium">{risk.company_name || risk.company_id || "企业"}</span>
+                  <CompanyNameTag companyId={risk.company_id} />
                   {risk.signals && <p className="text-xs text-muted-foreground">{risk.signals}</p>}
                 </div>
                 <span className={`rounded px-2 py-0.5 text-xs ${