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
  • New guide: extending server entry points with Cloudflare Workers handlers. Covers using Workers for SSR and fetch, queue processing, scheduled events, and Durable Objects via named exports. Includes practical code examples, local testing instructions, and links to Cloudflare Workers documentation for further reference.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a new docs section "Extending with Cloudflare Workers Handlers" showing that createServerEntry() returns a spreadable object and demonstrating adding queue, scheduled, and Durable Object handlers plus local testing notes.

Changes

Cohort / File(s)	Summary
Documentation: Cloudflare Workers Extension Pattern docs/start/framework/react/guide/server-entry-point.md	Added "Extending with Cloudflare Workers Handlers" section (+~45 lines) with examples showing spreading createServerEntry() to compose fetch, queue, scheduled handlers and named Durable Object exports; includes local testing curl snippet for scheduled handlers.

Sequence Diagram(s)

(Skipped — changes are documentation-only and do not introduce new runtime control-flow in code.)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• feat: createServerEntry #5859 — Demonstrates and documents createServerEntry() extensibility and Cloudflare Workers handler composition.

Suggested reviewers

• tannerlinsley
• schiller-manuel

Poem

🐰✨ I spread my paws and share the door,
Fetch, queue, and cron now roam and soar,
Durable friends in named array,
One worker runs them all today — hooray! 🥕

🚥 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 PR title clearly and concisely summarizes the main change: adding a documentation section about Cloudflare Workers handlers to the server entry point guide.
Linked Issues check	✅ Passed	The PR fulfills all coding-related requirements from issue #6487: documents the spreadable ServerEntry pattern, demonstrates queue/scheduled handlers, shows Durable Objects as named exports, and provides local testing guidance.
Out of Scope Changes check	✅ Passed	All changes are within scope—the PR only adds documentation to the server-entry-point.md file as required by the linked issue, with no unrelated alterations.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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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.