docs: add Cloudflare Workers handlers section to server entry point

[alexander-zuev]

Closes #6487

Adds documentation showing that createServerEntry() returns a spreadable object, enabling server.ts to serve as a full Cloudflare Worker entrypoint
with:

• SSR + Server Functions (fetch)
• Queue Consumer + Producer
• Cron Jobs (scheduled)
• Other Workers features (Durable Objects, etc.)

Tested and working in locally.

Summary by CodeRabbit

• Documentation
  • Added Cloudflare Workers guidance: two new sections showing how to extend the server entry point and server configuration to support Workers features (queues, scheduled events, Durable Objects) with examples and a link to Cloudflare Workers docs for further reference.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds Cloudflare Workers guidance to the Server Entry Point docs: two new subsections describe extending server.ts / createServerEntry() to support queue, scheduled, Durable Objects, and link to the Cloudflare Workers TanStack Start docs; includes local testing note for scheduled handlers.

Changes

Cohort / File(s)	Summary
Documentation: Cloudflare Workers extension docs/start/framework/react/guide/server-entry-point.md	Added two Cloudflare Workers subsections (under Server Entry Point and Server Configuration) explaining how createServerEntry() can be spread/extended to add queue, scheduled, Durable Object exports; includes example code and local testing curl note; ~+26/+4 lines.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Suggested reviewers

• schiller-manuel
• tannerlinsley

Poem

🐰✨ I hopped into docs with a cheerful wink,
Spread server entries quicker than you think,
Fetch, queue, and cron all in a row,
Durable friends ready — let's watch them go! 🥕

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding Cloudflare Workers handlers documentation to the server entry point guide.
Linked Issues check	✅ Passed	The PR adds Cloudflare Workers sections showing how to extend server.ts with queue, scheduled handlers, and Durable Objects, fulfilling issue #6487 objectives.
Out of Scope Changes check	✅ Passed	All changes are scoped to the server entry point documentation, directly addressing the linked issue requirements with no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[MattieTK]

@alexander-zuev We've now improved our docs on the TanStack Start documentation page on the Cloudflare Workers docs page if you want to point to that.

[alexander-zuev]

nice, @MattieTK added this one liner to the PR:
For a comprehensive guide covering Durable Objects, Workflows, Service Bindings, and other Cloudflare-specific features, see the Cloudflare Workers documentation for TanStack Start.

[schiller-manuel]

i think we can reduce this to just the link to the cloudflare docs

[CanRau]

@MattieTK amazing to have more in-depths guides 🙏
looks still a little outdated tho I think?
createServerFn still uses .validator instead of .inputValidator docs
And main in the custom entrypoint example should point to src/server.ts instead of app/server.ts I think 🤔

[alexander-zuev]

reduced to 2 lines @schiller-manuel