[Playground] Playground page

[justinyoo]

should look like Azure OpenAI Studio

[justinyoo]

• 참고링크:
  • Fluent UI for Blazor: https://www.fluentui-blazor.net/
  • Blazor Event Handling: https://learn.microsoft.com/aspnet/core/blazor/components/event-handling

[justinyoo]

• Feature/Story: #250

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• Feature/Story: #19

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