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.

internal/apps/openflare/tasks/ssl_renew_test.go

@@ -49,7 +49,7 @@ func TestRunSSLRenewJobTriggersDueCertificates(t *testing.T) {
 	})
 	defer restore()
 
-	now := time.Date(2026, 6, 18, 12, 0, 0, 0, time.UTC)
+	now := time.Now().UTC()
 	due := &model.TLSCertificate{
 		Name:          "due-cert",
 		Provider:      "acme",