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/layout.tsx

@@ -0,0 +1,43 @@
+import type React from "react"
+import DocSidebar from "@/components/DocSidebar"
+import Footer from "@/components/footer"
+import { DocNavigation } from "@/components/ui/doc-navigation"
+import { DocBreadcrumb } from "@/components/DocBreadcrumb"
+import { DocTableOfContents } from "@/components/DocTableOfContents"
+
+/**
+ * Docs layout — three-column shell matching the Hermes / Docusaurus
+ * pattern the user asked for:
+ *
+ *   ┌─────────┬───────────────────────┬─────────┐
+ *   │ Sidebar │ Breadcrumb + Article  │ ToC     │
+ *   │ (fixed) │ (scrollable)          │ (sticky)│
+ *   └─────────┴───────────────────────┴─────────┘
+ *
+ * - Sidebar: 18 rem, fixed left on lg+, slide-down drawer on mobile.
+ * - Main: max width capped at ~980 px for comfortable line length.
+ * - ToC: 14 rem, sticky right rail, only shown on xl+ where there is
+ *   enough horizontal room to display it without crowding the article.
+ */
+export default function DocsLayout({ children }: { children: React.ReactNode }) {
+  return (
+    <div className="flex flex-col min-h-screen bg-white text-gray-900">
+      <DocSidebar />
+      <div className="flex flex-col flex-1 pt-16 lg:pt-0 lg:pl-72">
+        <div className="flex flex-1">
+          <main className="flex-1 min-w-0 p-4 lg:p-6 pt-6 lg:pt-6">
+            <div className="max-w-3xl mx-auto" style={{ maxWidth: "980px" }}>
+              <DocBreadcrumb />
+              {children}
+              <DocNavigation />
+            </div>
+          </main>
+          <aside className="hidden xl:block w-56 shrink-0 py-6 pr-6">
+            <DocTableOfContents />
+          </aside>
+        </div>
+        <Footer />
+      </div>
+    </div>
+  )
+}