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/guilds/page.tsx

@@ -0,0 +1,33 @@
+import { GuildsManager } from '@/components/owner/owner-forms';
+import { getLocale, t } from '@/lib/i18n';
+import { prisma } from '@/lib/prisma';
+
+export default async function OwnerGuildsPage() {
+  const locale = await getLocale();
+  const [guilds, blacklist] = await Promise.all([
+    prisma.guild.findMany({
+      include: { settings: true },
+      orderBy: { createdAt: 'desc' },
+      take: 200
+    }),
+    prisma.guildBlacklist.findMany()
+  ]);
+  const blacklisted = new Set(blacklist.map((entry) => entry.guildId));
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h1 className="text-2xl font-semibold">{t(locale, 'owner.guilds.title')}</h1>
+        <p className="text-sm text-muted-foreground">{t(locale, 'owner.guilds.subtitle')}</p>
+      </div>
+      <GuildsManager
+        initialGuilds={guilds.map((guild) => ({
+          id: guild.id,
+          locale: guild.settings?.locale ?? 'de',
+          createdAt: guild.createdAt.toISOString(),
+          blacklisted: blacklisted.has(guild.id)
+        }))}
+      />
+    </div>
+  );
+}