What would you like to be added?

Allow users to customize the banner area displayed at the top when Qwen Code CLI starts, including:

1. Custom ASCII Art Logo: Allow users to replace the default "Qwen Code" ASCII art
2. Custom Brand Title: Allow users to modify the displayed title text
3. Hide Banner: Allow users to completely hide the banner area

Configuration should be supported via config files (e.g., ~/.qwen/settings.json or project-level .qwen/settings.json), for example:

{
  "ui": {
    "customAsciiArt": "custom ASCII art string",
    "customBannerTitle": "My Brand",
    "hideBanner": false
  }
}

Why is this needed?

Third-party brand integration: When enterprises or teams integrate Qwen Code into their own products or services, they need to display their own brand identity instead of the default "Qwen Code" to achieve a white-label experience.

Personalization: Individual users may want to customize the terminal interface appearance to better match their personal preferences or team standards.

Multi-tenant scenarios: In shared environments, different teams can distinguish their respective Qwen Code instances through customized banners.

Additional context

N/A