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]/layout.tsx

@@ -0,0 +1,186 @@
+import { Suspense } from "react"
+import Navbar from "@/components/navbar"
+import MouseMoveEffect from "@/components/mouse-move-effect"
+import { PagefindHighlighter } from "@/components/pagefind-highlighter"
+import { LocaleHtmlSync } from "@/components/locale-html-sync"
+import type React from "react"
+import { notFound } from "next/navigation"
+import { NextIntlClientProvider, hasLocale } from "next-intl"
+import { setRequestLocale } from "next-intl/server"
+import { routing } from "@/i18n/routing"
+
+/**
+ * Tell Next.js which locales to pre-render under [locale]. Required
+ * for `output: "export"` — without this, the static build can't enumerate
+ * the dynamic segment and falls back to ISR (which static export doesn't
+ * support).
+ */
+export function generateStaticParams() {
+  return routing.locales.map((locale) => ({ locale }))
+}
+
+/**
+ * Force every nested page to render statically. Without this Next.js
+ * treats pages that don't explicitly call `setRequestLocale()` as
+ * dynamic (because next-intl's `getRequestConfig` reads
+ * `requestLocale` which internally falls back to `headers()`),
+ * breaking the `output: "export"` build with
+ * `StaticGenBailoutError: dynamic = "error" couldn't be rendered
+ * statically because it used 'headers'`. Marking force-static here
+ * spares us from adding `setRequestLocale(locale)` to all 100+ docs
+ * pages individually — the locale comes from the [locale] segment of
+ * the URL, which is part of `generateStaticParams`, so each combination
+ * is pre-rendered without ever needing request headers.
+ */
+export const dynamic = "force-static"
+
+export const metadata = {
+  title: "ProxMenux — Interactive Menu and Web Dashboard for Proxmox VE",
+  generator: "Next.js",
+  applicationName: "ProxMenux",
+  referrer: "origin-when-cross-origin",
+  keywords: [
+    "Proxmox VE",
+    "Proxmox",
+    "PVE",
+    "ProxMenux",
+    "MacRimi",
+    "proxmox menu",
+    "proxmox tui",
+    "proxmox dashboard",
+    "proxmox web dashboard",
+    "proxmox monitor",
+    "proxmox open source",
+    "proxmox community",
+    "proxmox helper script",
+    "proxmox automation",
+    "menu-driven",
+    "self-hosted",
+    "virtualization",
+    "VM management",
+    "LXC management",
+    "container management",
+  ],
+  authors: [{ name: "MacRimi", url: "https://github.com/MacRimi" }],
+  creator: "MacRimi",
+  publisher: "MacRimi",
+  description:
+    "ProxMenux is an open-source, menu-driven tool for Proxmox VE management with a self-hosted web dashboard. Run post-install tweaks, create VMs and LXC containers, manage GPU passthrough, disks, network and storage from an interactive terminal menu — and watch host health, metrics and notifications from a browser.",
+  formatDetection: {
+    email: false,
+    address: false,
+    telephone: false,
+  },
+  metadataBase: new URL("https://proxmenux.com"),
+  alternates: {
+    canonical: "https://proxmenux.com",
+    types: {
+      "application/rss+xml": "https://proxmenux.com/rss.xml",
+    },
+  },
+  openGraph: {
+    title: "ProxMenux — Interactive Menu and Web Dashboard for Proxmox VE",
+    description:
+      "Open-source CLI/TUI plus a self-hosted web dashboard for Proxmox VE management. Run scripts and wizards from a terminal menu, or watch host health and notifications from a browser.",
+    url: "https://proxmenux.com",
+    siteName: "ProxMenux",
+    images: [
+      {
+        url: "https://proxmenux.com/main.png",
+        width: 1363,
+        height: 735,
+        alt: "ProxMenux — Interactive Menu and Web Dashboard for Proxmox VE",
+      },
+    ],
+    locale: "en_US",
+    type: "website",
+  },
+  twitter: {
+    card: "summary_large_image",
+    title: "ProxMenux — Interactive Menu and Web Dashboard for Proxmox VE",
+    description:
+      "Open-source CLI/TUI + self-hosted web dashboard for Proxmox VE management.",
+    images: ["https://proxmenux.com/main.png"],
+    creator: "@MacRimi",
+  },
+  robots: {
+    index: true,
+    follow: true,
+    googleBot: {
+      index: true,
+      follow: true,
+      "max-video-preview": -1,
+      "max-image-preview": "large",
+      "max-snippet": -1,
+    },
+  },
+  icons: {
+    icon: [
+      { url: "/favicon.ico", sizes: "any" },
+      { url: "/icon.svg", type: "image/svg+xml" },
+    ],
+    apple: [{ url: "/apple-touch-icon.png", sizes: "180x180" }],
+  },
+}
+
+export default async function LocaleLayout({
+  children,
+  params,
+}: {
+  children: React.ReactNode
+  params: Promise<{ locale: string }>
+}) {
+  const { locale } = await params
+
+  if (!hasLocale(routing.locales, locale)) {
+    notFound()
+  }
+
+  setRequestLocale(locale)
+
+  return (
+    <NextIntlClientProvider>
+      {/* LocaleHtmlSync writes `document.documentElement.lang = locale`
+          after hydration so the active language is reflected in <html lang>
+          for accessibility tools and SEO crawlers that execute JS. The
+          static root layout always serves lang="en" as the fallback for
+          users with JavaScript disabled. */}
+      <LocaleHtmlSync locale={locale} />
+      <script
+        type="application/ld+json"
+        dangerouslySetInnerHTML={{
+          __html: JSON.stringify({
+            "@context": "https://schema.org",
+            "@type": "SoftwareApplication",
+            name: "ProxMenux",
+            description:
+              "Open-source, menu-driven tool for Proxmox VE management with a self-hosted web dashboard. Includes post-install tweaks, VM and LXC creation, GPU and Coral TPU passthrough, disk, storage and network workflows, plus a Health Monitor with notifications and a REST API.",
+            applicationCategory: "DeveloperApplication",
+            operatingSystem: "Linux",
+            offers: {
+              "@type": "Offer",
+              price: "0",
+              priceCurrency: "USD",
+            },
+            author: {
+              "@type": "Person",
+              name: "MacRimi",
+              url: "https://github.com/MacRimi",
+            },
+            license: "https://github.com/MacRimi/ProxMenux/blob/main/LICENSE",
+            codeRepository: "https://github.com/MacRimi/ProxMenux",
+            url: "https://proxmenux.com",
+            image: "https://proxmenux.com/main.png",
+          }),
+        }}
+      />
+      <Navbar />
+      <MouseMoveEffect />
+      <div className="pt-16 md:pt-16">{children}</div>
+      <script src="/pagefind/pagefind-highlight.js" type="module" defer />
+      <Suspense fallback={null}>
+        <PagefindHighlighter />
+      </Suspense>
+    </NextIntlClientProvider>
+  )
+}