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/tsconfig.app.json

@@ -15,6 +15,7 @@
     "moduleDetection": "force",
     "noEmit": true,
     "jsx": "react-jsx",
+    "paths": { "@/*": ["./src/*"] },
 
     /* Linting */
     "noUnusedLocals": true,