FRE-1670: publish /terms and the support address on the Nessa site

nessa.freno.me/terms was a live 404 although AppSettings.termsOfServiceURL
links it from Settings > Legal and the paywall. The document existed only on
an unmerged branch and had no host-dispatch route, so it could not serve on
the subdomain. Carry the Terms of Use page, add the /terms dispatcher, and
publish nessa-support@freno.me on terms, privacy, contact and deletion.

- src/routes/terms.tsx: host-aware dispatch for nessa; other sites 404.
- src/routes/nessa/terms.tsx: the Terms page; its contact section names the
  support address.
- privacy: add the controller clause and the support address.
- contact/deletion: show the support address; deletion also accepts a
  request by email.
- subdomain-dispatch.test.ts: list directories before filtering to .tsx
  files. The old predicate only ever received file names, so it asserted
  over an empty list and missed the missing /terms dispatch.
- support-contact.test.ts: guard that every contact route renders the one
  address the app shows.

App side unchanged: termsOfServiceURL stays https://nessa.freno.me/terms.

src/routes/terms.tsx

@@ -0,0 +1,30 @@
+import { Switch, Match } from "solid-js";
+import { useSite } from "~/context/SiteContext";
+import NotFound from "./[...404]";
+import NessaTermsOfUse from "./nessa/terms";
+
+/**
+ * Host-aware terms-of-use route — `/terms`.
+ *
+ * The public browser path `/terms` is what the Nessa app links from
+ * Settings › Legal and from the subscription paywall
+ * (`AppSettings.termsOfServiceURL`). Production Vercel deployments do not
+ * apply the `vercel.json` host rewrites (the Nitro Build Output API config
+ * supersedes them), so the subdomain page needs this top-level dispatch file
+ * to be reachable — without it `nessa.freno.me/terms` is a 404 even though
+ * `src/routes/nessa/terms.tsx` exists.
+ *
+ * Only Nessa publishes terms of use today. Every other site — and the main
+ * site — falls back to the 404 handler rather than borrowing another
+ * product's legal document.
+ */
+export default function TermsPage() {
+  const site = useSite();
+  return (
+    <Switch fallback={<NotFound />}>
+      <Match when={site().id === "nessa"}>
+        <NessaTermsOfUse />
+      </Match>
+    </Switch>
+  );
+}