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/features/telegram/api.ts

@@ -0,0 +1,18 @@
+import { apiRequest } from '@/shared/api/client'
+import type { LinkTokenResponse, TelegramLoginRequestResponse, TelegramLoginStatusResponse } from '@/shared/api/types'
+
+export function createLinkToken() {
+  return apiRequest<LinkTokenResponse>('/auth/telegram/link-token', { method: 'POST' })
+}
+
+export function unlinkTelegram() {
+  return apiRequest<void>('/auth/telegram/unlink', { method: 'POST' })
+}
+
+export function createLoginRequest() {
+  return apiRequest<TelegramLoginRequestResponse>('/auth/telegram/login-request', { method: 'POST' })
+}
+
+export function getLoginRequestStatus(id: string) {
+  return apiRequest<TelegramLoginStatusResponse>(`/auth/telegram/login-request/${id}`)
+}