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/dashboard/[guildId]/layout.tsx

@@ -3,6 +3,7 @@ import type { ReactNode } from 'react';
 import { DashboardShell } from '@/components/layout/dashboard-shell';
 import { requireGuildAccessOrRedirect } from '@/lib/auth';
 import { getManageableGuilds } from '@/lib/guilds';
+import { isOwnerUser } from '@/lib/owner-auth';
 
 interface GuildLayoutProps {
   children: ReactNode;
@@ -20,9 +21,16 @@ export default async function GuildLayout({ children, params }: GuildLayoutProps
   }
 
   const otherGuilds = guilds.filter((guild) => guild.id !== guildId);
+  const showOwnerLink = await isOwnerUser(session.user.id);
 
   return (
-    <DashboardShell guildId={guildId} currentGuild={currentGuild} otherGuilds={otherGuilds} user={session.user}>
+    <DashboardShell
+      guildId={guildId}
+      currentGuild={currentGuild}
+      otherGuilds={otherGuilds}
+      user={session.user}
+      showOwnerLink={showOwnerLink}
+    >
       {children}
     </DashboardShell>
   );