Implement Owner Panel features and maintenance mode handling

- Introduced the Owner Panel with new routes and UI components for managing guilds, user blacklists, feature flags, and bot presence.
- Added maintenance mode functionality to prevent non-owner users from executing commands during maintenance periods.
- Enhanced localization with new keys for Owner Panel features in both English and German.
- Updated job processing to include a presence refresh job, ensuring the bot's status is regularly updated.
- Improved environment configuration to support owner user IDs for access control.

apps/webui/src/app/owner/audit/page.tsx

@@ -0,0 +1,37 @@
+import { Card, CardContent } from '@/components/ui/card';
+import { getLocale, t } from '@/lib/i18n';
+import { listOwnerAudit } from '@/lib/owner-audit';
+
+export default async function OwnerAuditPage() {
+  const [locale, entries] = await Promise.all([getLocale(), listOwnerAudit(100)]);
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-2xl font-semibold">{t(locale, 'owner.audit.title')}</h1>
+        <p className="text-sm text-muted-foreground">{t(locale, 'owner.audit.subtitle')}</p>
+      </div>
+      <Card>
+        <CardContent className="divide-y divide-border p-0">
+          {entries.length === 0 ? (
+            <p className="p-4 text-sm text-muted-foreground">{t(locale, 'owner.common.empty')}</p>
+          ) : (
+            entries.map((entry) => (
+              <div key={entry.id} className="flex flex-col gap-1 px-4 py-3 text-sm sm:flex-row sm:justify-between">
+                <div>
+                  <p className="font-medium">{entry.action}</p>
+                  <p className="text-muted-foreground">
+                    {entry.actorUserId}
+                    {entry.targetType ? ` · ${entry.targetType}` : ''}
+                    {entry.targetId ? ` · ${entry.targetId}` : ''}
+                  </p>
+                </div>
+                <span className="text-muted-foreground">{new Date(entry.createdAt).toLocaleString()}</span>
+              </div>
+            ))
+          )}
+        </CardContent>
+      </Card>
+    </div>
+  );
+}