Introduce mock cloud components for easier maintainability (#49)

src/cloud/CloudConnect.tsx

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+export const CloudConnect = ({ accentColor }: { accentColor: string }) => {
+  return null;
+};
+
+export const CLOUD_ENABLED = false;

src/cloud/README.md

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+Files in this `cloud/` directory can be ignored. They are mocks which we override in our private, hosted version of the agents-playground that supports LiveKit Cloud authentication.

src/cloud/useCloud.tsx

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+export function CloudProvider({ children }: { children: React.ReactNode }) {
+  return <>{children}</>;
+}