feat(admin): sidebar entry for app-logs

Adds the `app-logs` row to `<AdminShell>` so the new section shows up
in the admin sidebar (desktop) and mobile section strip alongside
Login Overview and Backups. Uses `lucide-react`'s `FileText` icon
because nothing else in the bundle reads as "structured log lines".

The mobile-strip / desktop-sidebar pattern follows the conditional
admin-only nav established in v1.4.15 A1 and v1.4.16 A1: the global
sidebar still surfaces a single `/admin` link, and the per-section
nav lives inside the admin shell.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/admin/admin-shell.tsx

@@ -20,6 +20,7 @@ import {
   AlertTriangle,
   Bell,
   Database,
+  FileText,
   KeyRound,
   Inbox,
   Plug,
@@ -93,6 +94,11 @@ export const ADMIN_SECTIONS: readonly AdminSection[] = [
     titleKey: "admin.section.login-overview.title",
     icon: ScrollText,
   },
+  {
+    slug: "app-logs",
+    titleKey: "admin.section.app-logs.title",
+    icon: FileText,
+  },
   {
     slug: "backups",
     titleKey: "admin.section.backups.title",