chore: v2.8.5 — Trash opens on one folder per user, server setup installs S3

- Files → Trash: ONE sidebar entry. An admin's opens on a folder per user's
  Trash (My Trash first, item counts from GET /api/homes/trash, an unreadable
  one showing its error); a folder opens that user's Trash (path bar
  Trash › user, Up back to the folders). An admin may restore/purge in
  another user's Trash (audited); purging asks first. The merged "All users"
  list is gone from the UI.
- A home's Trash is its user's whole recycle bin (home store + host store,
  items tagged `store`).
- `agenthub server setup` installs one Linux user per account on Linux by
  default (`--no-system` opts out); install-system messages drop `sudo`.
- Settings → Git: the author email suggests <username>@<AGENTHUB_EMAIL_DOMAIN>.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

client/src/components/settings/GitIdentitySettings.tsx

@@ -2,8 +2,9 @@
  * @file GitIdentitySettings.tsx
  * @description Settings → Git → **Your git identity** (`/api/me/git`): the
  * commit author (name + email in the account's global git config — prefilled
- * from Settings → Account while unset, since a member's commits fail without
- * one), the SSH
+ * from Settings → Account while unset, the email else `<username>@smartgift.vn`,
+ * since a member's commits fail without one; a new SSH key is labelled with
+ * that email), the SSH
  * keys a clone (Add workspace → Clone) and the pushes from that clone use —
  * an ED25519 and/or an RSA one (AWS CodeCommit takes only RSA) — make one, copy its public half to add to GitHub/GitLab, replace or delete
  * it, and whether git typed in the account's own terminal uses it too (a
@@ -308,7 +309,7 @@ export function GitIdentitySettings() {
   const member = id.account === "member";
   const authorShown = author ?? {
     name: id.author.name ?? me?.displayName ?? me?.username ?? "",
-    email: id.author.email ?? me?.email ?? "",
+    email: id.author.email ?? me?.email ?? id.defaultEmail ?? "",
   };
   const authorUnset = !id.author.name || !id.author.email;
   const authorDirty =