后端与全仓代码质量清理（golangci 扩展集 · 测试质量 · 并发安全 · 文档同步）

代码质量全量清理，零行为变化：golangci 扩展集 13 类 linter（gosec/modernize/perfsprint/canonicalheader/usestdlibvars/wastedassign/intrange/errorlint/forcetypeassert/recvcheck/exhaustive/unparam）全量修复，测试代码质量（testifylint/thelper/usetesting）25→0，frpc 进程生命周期真 bug（进程组击杀）、全仓 go test -race 6 类数据竞争（含 1 个生产竞争）、SPDX license 头补齐 131 文件、前端测试套件 next-intl 迁移后 44 失败→全绿、过期 swagger 文档重新生成、pnpm-workspace 构建审批。

Experiments: #2-#17, #18, #20, #21, #23
Metric: total_issues 108 → 8 (-92.6%)

frontend/tests/zone/zone-page.test.tsx

@@ -8,6 +8,8 @@ import {
   TlsCertificateService,
   ZoneService,
 } from '@/lib/services/openflare';
+import { NextIntlClientProvider } from 'next-intl';
+import zhCN from '@/messages/zh-CN.json';
 
 class ResizeObserverMock {
   observe() {}
@@ -68,9 +70,11 @@ function renderPage(zoneId: number, paramZoneId = zoneId) {
     },
   });
   return render(
-    <QueryClientProvider client={client}>
-      <ZonePageClient />
-    </QueryClientProvider>,
+    <NextIntlClientProvider locale='zh-CN' messages={zhCN} timeZone='Asia/Shanghai'>
+      <QueryClientProvider client={client}>
+        <ZonePageClient />
+      </QueryClientProvider>
+    </NextIntlClientProvider>,
   );
 }
 
@@ -113,7 +117,7 @@ describe('ZonePageClient', () => {
     expect(
       await screen.findByRole('heading', { name: 'example.com' }),
     ).toBeVisible();
-    expect(await screen.findByText('唯一访问者')).toBeVisible();
+    expect(await screen.findByText('查询窗口独立访客')).toBeVisible();
     expect(screen.getByText('请求总数')).toBeVisible();
     expect(screen.getByText('已提供的数据总计')).toBeVisible();
     expect(screen.getByRole('tab', { name: '域名 (0)' })).toBeVisible();