docs(guide): integrate better auth

[nrjdalal]

• docs/start/framework/react/integrate-better-auth.md
• preview: https://github.com/nrjdalal/better-start
• online docs preview: https://tanstack-com.vercel.app/start/latest/docs/framework/react/integrate-better-auth

[nx-cloud]

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---

☁️ Nx Cloud last updated this comment at 2025-06-03 13:21:23 UTC

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commit: 3e58dec

[ajxbit]

@nrjdalal can you check the above issue as well? The above example does not work for tanstackStart({ target: "cloudflare-module" })

[Meliketoaste]

Supporting the better-auth cli in Start https://www.better-auth.com/docs/concepts/cli#init would be really cool if you want to work on that.

[max-programming]

The createServerFileRoute function should have the server route path in it

Suggested change

	export const ServerRoute = createServerFileRoute().methods({
	export const ServerRoute = createServerFileRoute('/api/auth/$').methods({