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/components/layout/dashboard-shell.tsx

@@ -9,17 +9,25 @@ interface DashboardShellProps {
   currentGuild: DashboardGuild;
   otherGuilds: DashboardGuild[];
   user: SessionUser;
+  showOwnerLink?: boolean;
   children: ReactNode;
 }
 
-export function DashboardShell({ guildId, currentGuild, otherGuilds, user, children }: DashboardShellProps) {
+export function DashboardShell({
+  guildId,
+  currentGuild,
+  otherGuilds,
+  user,
+  showOwnerLink = false,
+  children
+}: DashboardShellProps) {
   return (
     <div className="flex min-h-screen">
       <Sidebar guildId={guildId} />
       <div className="flex flex-1 flex-col">
         <header className="flex h-14 items-center justify-between border-b border-border px-6">
           <ServerSwitcher currentGuild={currentGuild} otherGuilds={otherGuilds} />
-          <UserMenu user={user} />
+          <UserMenu user={user} showOwnerLink={showOwnerLink} />
         </header>
         <main className="flex-1 px-6 py-8">
           <div className="mx-auto w-full max-w-[1200px]">{children}</div>