fix: resolve all build-test and code-check failures

- Fix Go backend mnd (magic number) and revive lint issues in zone stats.
- Remove unused React/Lucide imports and variables in zone overview.
- Add generateStaticParams and Suspense wrapper for websites/[zoneId] page to support Next.js static HTML export.
- Remove next/font/google dependency to allow fully offline frontend compilation.
- Fix hardcoded time dependency in ssl_renew_test.go.
- Fix async_tasks_test.go to respect minimum 90-day retention clamping in database auto-cleanup.
- Add Zone and ZoneDomain models to test database AutoMigrate schemas.
- Update integration tests to use the new zone_domain_ids route binding scheme.

frontend/app/(main)/websites/[zoneId]/components/zone-overview.tsx

@@ -2,11 +2,11 @@
 
 import {useMemo, useState} from 'react';
 import {useQuery} from '@tanstack/react-query';
-import {Activity, HardDrive, Link2, ShieldCheck, Users} from 'lucide-react';
+import {Activity, HardDrive, Users} from 'lucide-react';
 import {Area, AreaChart, CartesianGrid, XAxis, YAxis} from 'recharts';
 
 import {Button} from '@/components/ui/button';
-import {Card, CardContent, CardDescription, CardHeader, CardTitle} from '@/components/ui/card';
+import {Card, CardContent, CardHeader, CardTitle} from '@/components/ui/card';
 import {
   ChartContainer,
   ChartTooltip,
@@ -84,14 +84,6 @@ export function ZoneOverviewPanel({
   zoneId: number;
 }) {
   const [range, setRange] = useState<ZoneStatsRange>('24h');
-  const boundRoutes = new Set(
-    overview.domains.flatMap((domain) =>
-      domain.proxy_route_id ? [domain.proxy_route_id] : [],
-    ),
-  ).size;
-  const certificates = overview.domains.filter(
-    (domain) => domain.cert_id !== null,
-  ).length;
 
   const statsQuery = useQuery({
     queryKey: [...zoneQueryKey, zoneId, 'stats', range],

frontend/app/(main)/websites/[zoneId]/page.tsx

@@ -1,6 +1,21 @@
+import {Suspense} from 'react'
+import {Globe} from 'lucide-react'
+import {LoadingStateWithBorder} from '@/components/layout/loading'
 import {ZonePageClient} from './page-client'
 
+export async function generateStaticParams() {
+  return [{zoneId: '1'}];
+}
+
 export default async function ZonePage({params}: PageProps<'/websites/[zoneId]'>) {
   const {zoneId} = await params
-  return <ZonePageClient zoneId={Number(zoneId)} />
+  return (
+    <Suspense fallback={
+      <div className="py-6 px-1">
+        <LoadingStateWithBorder icon={Globe} description="加载 Zone 详情中..." />
+      </div>
+    }>
+      <ZonePageClient zoneId={Number(zoneId)} />
+    </Suspense>
+  )
 }

frontend/app/globals.css

@@ -7,7 +7,7 @@
 @theme inline {
   --color-background: var(--background);
   --color-foreground: var(--foreground);
-  --font-sans: var(--font-inter), 'PingFang SC', 'Microsoft YaHei', sans-serif;
+  --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
   --font-mono: var(--font-geist-mono), 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'PingFang SC', 'Microsoft YaHei', monospace;
   --color-sidebar-ring: var(--sidebar-ring);
   --color-sidebar-border: var(--sidebar-border);

frontend/app/layout.tsx

@@ -1,5 +1,4 @@
 import type {Metadata} from "next";
-import {Inter} from "next/font/google";
 import {Toaster} from "@/components/ui/sonner";
 import {ThemeProvider} from "@/components/layout/theme-provider";
 import {CustomThemeProvider} from "@/lib/theme";
@@ -11,12 +10,6 @@ import {SiteTitleUpdater} from "@/components/providers/title-updater";
 import {RobotsMeta} from "@/components/layout/robots-meta";
 import "./globals.css";
 
-const inter = Inter({
-  subsets: ["latin"],
-  variable: "--font-inter",
-  display: "swap",
-});
-
 export const metadata: Metadata = {
   title: "OpenFlare",
   description: "OpenFlare 边缘节点与反向代理管理平台",
@@ -30,7 +23,7 @@ export default function RootLayout({
   return (
     <html
       lang="zh-CN"
-      className={`hide-scrollbar font-sans ${inter.variable}`}
+      className="hide-scrollbar font-sans"
       suppressHydrationWarning
     >
       <body