Enhance dashboard overview with activity summary and sidebar commands

- Integrated activity summary into the Guild Overview page, displaying message count, voice minutes, and active user count for the last 7 days.
- Updated sidebar to include a new "Commands" link for easier navigation.
- Added corresponding localization keys for activity metrics in both English and German JSON files.

apps/webui/src/app/dashboard/[guildId]/commands/page.tsx

@@ -0,0 +1,22 @@
+import { CommandsManager } from '@/components/modules/commands-manager';
+import { getLocale, t } from '@/lib/i18n';
+import { listCommandOverridesDashboard } from '@/lib/module-configs/commands';
+
+interface CommandsPageProps {
+  params: Promise<{ guildId: string }>;
+}
+
+export default async function CommandsPage({ params }: CommandsPageProps) {
+  const { guildId } = await params;
+  const [locale, commands] = await Promise.all([getLocale(), listCommandOverridesDashboard(guildId)]);
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-2xl font-semibold">{t(locale, 'modulePages.commands.title')}</h1>
+        <p className="text-sm text-muted-foreground">{t(locale, 'modulePages.commands.description')}</p>
+      </div>
+      <CommandsManager guildId={guildId} initialCommands={commands} />
+    </div>
+  );
+}