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/auth/store.ts

@@ -0,0 +1,17 @@
+import { create } from 'zustand'
+import type { CurrentUser } from '@/shared/api/types'
+
+type AuthState = {
+  user: CurrentUser | null
+  /** Пока не завершилась попытка тихого восстановления сессии при старте приложения. */
+  isBootstrapping: boolean
+  setUser: (user: CurrentUser | null) => void
+  finishBootstrap: () => void
+}
+
+export const useAuthStore = create<AuthState>((set) => ({
+  user: null,
+  isBootstrapping: true,
+  setUser: (user) => set({ user }),
+  finishBootstrap: () => set({ isBootstrapping: false }),
+}))