Add TanStack Start example integration with Builder.io

[paprikaf]

This PR adds a new example demonstrating the integration of Builder.io with TanStack Router.

The example includes:

• Server-side rendering (SSR) support
• Builder component registry
• Catch-all route for Builder pages
• Quick setup instructions

This helps expand our framework support to include TanStack Start, which is gaining popularity for React applications.

[changeset-bot]

⚠️ No Changeset found

Latest commit: b1f93b3

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[nx-cloud]

View your CI Pipeline Execution ↗ for commit b1f93b3.

Command	Status	Duration	Result
nx test @e2e/qwik-city	✅ Succeeded	8m 36s	View ↗
nx test @e2e/nuxt	✅ Succeeded	7m 31s	View ↗
nx test @e2e/nextjs-sdk-next-app	✅ Succeeded	7m 25s	View ↗
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nx test @e2e/angular-16-ssr	✅ Succeeded	5m 43s	View ↗
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☁️ Nx Cloud last updated this comment at 2025-05-01 17:16:29 UTC

[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
16906597	Triggered	Generic High Entropy Secret	b1f93b3	examples/tanstack-start/app/utils/builder-init.ts	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secret safely. Learn here the best practices.
3. Revoke and rotate this secret.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

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^{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}