feat: Add asset selector dropdown

[EmmyKay0026]

closes #162

Overview

This PR improves the user experience by replacing the free-text assetCode input in the CreateStreamForm with a dynamic dropdown. The list of available assets is now fetched directly from the backend configuration, ensuring that users can only select assets currently supported by the platform.

Changes

Backend

• Added a new GET /api/config endpoint that exposes the ALLOWED_ASSETS configuration.

Frontend

• Added getConfig function to the API service layer.

• Updated CreateStreamForm to:

  - Fetch configuration on mount.
  

  • Render a dropdown when assets are successfully fetched. Implement a fallback to a text input if the API call fails or returns an empty list. Added logic to default the selection to USDC if it exists in the allowed list, or the first available asset otherwise.

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