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/dashboard.tsx

@@ -0,0 +1,58 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { useQuery } from '@tanstack/react-query'
+import { useTranslation } from 'react-i18next'
+import { useRequireAuth } from '@/features/auth/guards'
+import { ActivationGate } from '@/features/activation/ActivationGate'
+import { ConfigCard } from '@/features/configs/ConfigCard'
+import { CreateConfigDialog } from '@/features/configs/CreateConfigDialog'
+import { SubscriptionCard } from '@/features/configs/SubscriptionCard'
+import { getMyConfigs } from '@/features/configs/api'
+
+export const Route = createFileRoute('/dashboard')({ component: DashboardPage })
+
+function DashboardPage() {
+  const { isReady } = useRequireAuth()
+
+  if (!isReady) return null
+
+  return (
+    <ActivationGate>
+      <ConfigsList />
+    </ActivationGate>
+  )
+}
+
+function ConfigsList() {
+  const { t } = useTranslation()
+  const { data, isLoading } = useQuery({ queryKey: ['my-configs'], queryFn: getMyConfigs })
+
+  return (
+    <div className="mx-auto flex w-full max-w-4xl flex-col gap-6 px-6 py-10">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-semibold tracking-tight">{t('configs.title')}</h1>
+          {data && (
+            <p className="text-sm text-muted-foreground">
+              {data.maxConfigs < 0
+                ? t('configs.quotaUnlimited', { used: data.configs.length })
+                : t('configs.quota', { used: data.configs.length, max: data.maxConfigs })}
+            </p>
+          )}
+        </div>
+        <CreateConfigDialog />
+      </div>
+
+      {!isLoading && data && data.configs.length > 0 && <SubscriptionCard />}
+
+      {isLoading && <p className="text-sm text-muted-foreground">…</p>}
+
+      {!isLoading && data && data.configs.length === 0 && (
+        <p className="text-sm text-muted-foreground">{t('configs.empty')}</p>
+      )}
+
+      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
+        {data?.configs.map((config) => <ConfigCard key={config.id} config={config} />)}
+      </div>
+    </div>
+  )
+}