Implement rate limiting and enhance authentication flow

- Added rate limiting configuration for authentication endpoints, allowing customizable request limits via environment variables.
- Updated authentication flow to utilize HttpRequest for cookie management, ensuring secure handling of refresh tokens.
- Introduced a new endpoint to retrieve user subscription details.
- Enhanced the handling of Telegram bot token validation to prevent errors with empty tokens.
- Updated the application to serialize enums as strings for better documentation and compatibility with TypeScript.
- Improved test coverage for new features and adjustments in command handlers.

frontend/src/routes/settings.tsx

@@ -0,0 +1,24 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { useTranslation } from 'react-i18next'
+import { useRequireAuth } from '@/features/auth/guards'
+import { ChangePasswordForm } from '@/features/settings/ChangePasswordForm'
+import { TelegramLinkCard } from '@/features/settings/TelegramLinkCard'
+import { DeleteAccountSection } from '@/features/settings/DeleteAccountSection'
+
+export const Route = createFileRoute('/settings')({ component: SettingsPage })
+
+function SettingsPage() {
+  const { t } = useTranslation()
+  const { isReady } = useRequireAuth()
+
+  if (!isReady) return null
+
+  return (
+    <div className="mx-auto flex w-full max-w-2xl flex-col gap-6 px-6 py-10">
+      <h1 className="text-2xl font-semibold tracking-tight">{t('nav.settings')}</h1>
+      <ChangePasswordForm />
+      <TelegramLinkCard />
+      <DeleteAccountSection />
+    </div>
+  )
+}