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 comprehensive guide on extending server entry points with Cloudflare Workers handlers, including fetch, queue, scheduled events, and Durable Objects support, with complete code examples and local testing instructions.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds a new documentation section to the Server Entry Point guide explaining how createServerEntry() returns a spreadable object that can be extended with additional Cloudflare Workers handlers (queue, scheduled, Durable Objects). Includes usage examples and local testing instructions.

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 (+43 lines) with code example showing how to spread createServerEntry() result and add queue, scheduled, and Durable Object handlers; includes local testing curl snippet for scheduled handlers.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• TanStack/router#5859 — Documents and demonstrates the createServerEntry() API extensibility for Cloudflare Workers that the current PR explains in detail.

Suggested reviewers

• tannerlinsley
• schiller-manuel

Poem

🐰 ✨ A new path appears so clear,
Where handlers dance and workers cheer,
Queue and cron now hand-in-hand,
One mighty export rules the land!

🚥 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 reflects the primary change: adding documentation about Cloudflare Workers handlers to the server entry point guide.
Linked Issues check	✅ Passed	The documentation addition addresses all core objectives from issue #6487: demonstrates spreading serverEntry with additional handlers, shows Durable Objects as named exports, and includes local testing guidance.
Out of Scope Changes check	✅ Passed	All changes are directly within scope—only documentation was modified (server-entry-point.md) to address 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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