feat(hub): show "update available" notification in hub web UI (#1830)

* refactor, make opt-in, and deprecate /api/beszel/getkey in favor of /api/beszel/info

---------

Co-authored-by: henrygd <hank@henrygd.me>

internal/site/src/components/footer-repo-link.tsx

@@ -1,7 +1,11 @@
+import { useStore } from "@nanostores/react"
 import { GithubIcon } from "lucide-react"
+import { $newVersion } from "@/lib/stores"
 import { Separator } from "./ui/separator"
+import { Trans } from "@lingui/react/macro"
 
 export function FooterRepoLink() {
+	const newVersion = useStore($newVersion)
 	return (
 		<div className="flex gap-1.5 justify-end items-center pe-3 sm:pe-6 mt-3.5 mb-4 text-xs opacity-80">
 			<a
@@ -21,6 +25,19 @@ export function FooterRepoLink() {
 			>
 				Beszel {globalThis.BESZEL.HUB_VERSION}
 			</a>
+			{newVersion?.v && (
+				<>
+					<Separator orientation="vertical" className="h-2.5 bg-muted-foreground opacity-70" />
+					<a
+						href={newVersion.url}
+						target="_blank"
+						className="text-yellow-500 hover:text-yellow-400 duration-75"
+						rel="noopener"
+					>
+						<Trans context="New version available">{newVersion.v} available</Trans>
+					</a>
+				</>
+			)}
 		</div>
 	)
 }