feat(ui): show prominent logo on login page

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

ui/resources/views/pages/login.twig

@@ -6,8 +6,10 @@
 <div class="flex min-h-screen items-center justify-center bg-slate-50 px-4 dark:bg-slate-950">
     <div class="w-full max-w-md rounded-2xl border border-slate-200 bg-white p-8 shadow-sm dark:border-slate-800 dark:bg-slate-900">
         <div class="mb-6 text-center">
-            <h1 class="font-mono text-2xl font-bold tracking-tight">IRDB</h1>
-            <p class="mt-1 text-sm text-slate-500 dark:text-slate-400">Sign in to continue</p>
+            <img src="/assets/logo.svg" alt="IRDB" class="mx-auto h-24 w-24" />
+            <h1 class="mt-4 font-mono text-2xl font-bold tracking-tight">IRDB</h1>
+            <p class="mt-1 text-sm text-slate-500 dark:text-slate-400">IP Reputation Database</p>
+            <p class="mt-3 text-sm text-slate-500 dark:text-slate-400">Sign in to continue</p>
         </div>
 
         {% if oidc_enabled %}