Fixes oauth/callback route

[ruifigueira]

Partially fixes #228 (it also requires modelcontextprotocol/use-mcp#15 to land and use-mcp version to be upgraded)

• changed OAuthCallbackPage according to https://github.com/modelcontextprotocol/use-mcp?tab=readme-ov-file#with-react-router
• configure app as an SPA (https://developers.cloudflare.com/workers/static-assets/routing/single-page-application/#configuration)

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Latest commit: 5432ac3

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[threepointone]

we already fixed this, thank you for the pr!