Fix image path resolution in Agent08 using IWebHostEnvironment

[Copilot]

File.ReadAllBytesAsync("wwwroot/image.jpg") resolves relative to the process working directory, which breaks when the app is hosted with a non-default content root.

Changes

• Agent08.razor: Inject IWebHostEnvironment and resolve the image path via WebRootPath

// Before
var imageData = await File.ReadAllBytesAsync("wwwroot/image.jpg");

// After
@inject IWebHostEnvironment WebHostEnvironment
// ...
var imageData = await File.ReadAllBytesAsync(Path.Combine(WebHostEnvironment.WebRootPath, "image.jpg"));

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