complete i18n migration to /[locale]/ with EN+ES content

Full rewrite of the docs site under app/[locale]/ with next-intl
in localePrefix:"always" mode. Every page now exists at both
/en/<path> and /es/<path>; the root / shows a meta-refresh + JS
redirect to /<defaultLocale>/ so GitHub Pages serves something
on the apex URL.

Highlights:
- 107 doc pages migrated to file-per-page JSON namespaces under
  messages/en/ and messages/es/. Spanish content is fully
  translated (no copy-of-English placeholders).
- New documentation for the Active Suppressions section in the
  Settings tab and the per-event Dismiss dropdown in the Health
  Monitor modal.
- New screenshots: dismiss-duration-dropdown.png and an updated
  health-suppression-settings.png.
- Pagefind integrated for client-side search; index is built on
  every CI deploy (not committed).
- RSS feeds: per-locale at /<locale>/rss.xml plus root /rss.xml
  for backward compat.
- Removed the dead app/[locale]/guides/[slug]/ route — every
  guide now has its own static page and no markdown source
  remains.
- Fixed orphan link /guides/nvidia -> /guides/nvidia-manual in
  docs/hardware/nvidia-host.
- Removed obsolete components (footer2, calendar, drawer).

Verified locally with `npm ci && npm run build`: 2804 files in
out/, 231 pages indexed by pagefind, root redirect intact, both
locale roots and the new Active Suppressions docs render OK.

web/app/[locale]/docs/post-install/performance/page.tsx

@@ -0,0 +1,148 @@
+import type { Metadata } from "next"
+import { getTranslations, getMessages, setRequestLocale } from "next-intl/server"
+import { Link } from "@/i18n/navigation"
+import { ExternalLink } from "lucide-react"
+import { DocHeader } from "@/components/ui/doc-header"
+import { Callout } from "@/components/ui/callout"
+import CopyableCode from "@/components/CopyableCode"
+
+export async function generateMetadata({
+  params,
+}: {
+  params: Promise<{ locale: string }>
+}): Promise<Metadata> {
+  const { locale } = await params
+  const t = await getTranslations({ locale, namespace: "docs.postInstall.performance.meta" })
+  return { title: t("title"), description: t("description") }
+}
+
+type RelatedItem = { label: string; href: string; tail?: string; tailRich?: string }
+
+export default async function PostInstallPerformancePage({
+  params,
+}: {
+  params: Promise<{ locale: string }>
+}) {
+  const { locale } = await params
+  setRequestLocale(locale)
+  const t = await getTranslations({ locale, namespace: "docs.postInstall.performance" })
+
+  const messages = (await getMessages({ locale })) as unknown as {
+    docs: { postInstall: { performance: {
+      pigz: { doesItems: string[] }
+      related: { items: RelatedItem[] }
+    } } }
+  }
+  const doesItems = messages.docs.postInstall.performance.pigz.doesItems
+  const relatedItems = messages.docs.postInstall.performance.related.items
+
+  const code = (chunks: React.ReactNode) => <code>{chunks}</code>
+  const strong = (chunks: React.ReactNode) => <strong>{chunks}</strong>
+  const em = (chunks: React.ReactNode) => <em>{chunks}</em>
+  const pigzAnchor = (chunks: React.ReactNode) => (
+    <a href="https://zlib.net/pigz/" target="_blank" rel="noopener noreferrer" className="text-blue-600 hover:underline inline-flex items-center gap-1">
+      {chunks}
+      <ExternalLink className="w-3 h-3" />
+    </a>
+  )
+
+  return (
+    <div>
+      <DocHeader
+        title={t("header.title")}
+        description={t("header.description")}
+        section={t("header.section")}
+      />
+
+      <Callout variant="info" title={t("intro.title")}>
+        {t.rich("intro.body", { em })}
+      </Callout>
+
+      <h2 className="text-2xl font-semibold mt-10 mb-4 text-gray-900">{t("pigz.heading")}</h2>
+
+      <p className="mb-4 text-gray-800 leading-relaxed">
+        {t.rich("pigz.intro", { code, strong, a: pigzAnchor })}
+      </p>
+
+      <h3 className="text-lg font-semibold mt-6 mb-2 text-gray-900">{t("pigz.doesTitle")}</h3>
+      <p className="mb-3 text-gray-800 leading-relaxed">{t("pigz.doesIntro")}</p>
+      <ol className="list-decimal pl-6 space-y-2 text-gray-800 mb-4">
+        {doesItems.map((_, idx) => (
+          <li key={idx}>{t.rich(`pigz.doesItems.${idx}`, { code, em })}</li>
+        ))}
+      </ol>
+
+      <CopyableCode
+        code={`# What ProxMenux runs under the hood
+sed -i "s/#pigz:.*/pigz: 1/" /etc/vzdump.conf
+apt-get -y install pigz
+
+cat > /bin/pigzwrapper <<'EOF'
+#!/bin/sh
+PATH=/bin:$PATH
+GZIP="-1"
+exec /usr/bin/pigz "$@"
+EOF
+chmod +x /bin/pigzwrapper
+
+# Only replaces gzip if not already replaced (idempotent)
+[ ! -f /bin/gzip.original ] && mv /bin/gzip /bin/gzip.original \\
+  && cp /bin/pigzwrapper /bin/gzip && chmod +x /bin/gzip`}
+        className="my-4"
+      />
+
+      <Callout variant="warning" title={t("pigz.replacesTitle")}>
+        {t.rich("pigz.replacesBody", { code })}
+      </Callout>
+
+      <Callout variant="danger" title={t("pigz.revertTitle")}>
+        {t.rich("pigz.revertBody", { strong })}
+      </Callout>
+
+      <CopyableCode
+        code={`# Manual rollback of pigz
+mv /bin/gzip.original /bin/gzip    # restore original binary
+rm /bin/pigzwrapper
+sed -i 's/^pigz: 1/#pigz: 1/' /etc/vzdump.conf
+# Optional: remove the package
+apt purge pigz`}
+        className="my-4"
+      />
+
+      <h3 className="text-lg font-semibold mt-6 mb-2 text-gray-900">{t("pigz.verifyTitle")}</h3>
+      <p className="mb-3 text-gray-800 leading-relaxed">
+        {t.rich("pigz.verifyBody", { code })}
+      </p>
+      <CopyableCode
+        code={`# Confirm gzip now points to pigz
+gzip --version
+# Expected first line: "pigz 2.x … by Mark Adler"
+
+# Compare throughput (create a 1GB file of random data and compress it)
+dd if=/dev/urandom of=/tmp/test.bin bs=1M count=1024 status=none
+time gzip -k /tmp/test.bin       # uses pigz — parallel
+rm /tmp/test.bin.gz
+
+time /bin/gzip.original -k /tmp/test.bin   # original single-threaded gzip
+rm /tmp/test.bin /tmp/test.bin.gz`}
+        className="my-4"
+      />
+
+      <Callout variant="tip" title={t("pigz.whenTitle")}>
+        {t.rich("pigz.whenBody", { strong })}
+      </Callout>
+
+      <h2 className="text-2xl font-semibold mt-10 mb-4 text-gray-900">{t("related.heading")}</h2>
+      <ul className="list-disc pl-6 text-gray-800 leading-relaxed space-y-1">
+        {relatedItems.map((item, idx) => (
+          <li key={item.href}>
+            <Link href={item.href} className="text-blue-600 hover:underline">
+              {item.label}
+            </Link>
+            {item.tailRich ? t.rich(`related.items.${idx}.tailRich`, { code }) : item.tail}
+          </li>
+        ))}
+      </ul>
+    </div>
+  )
+}