feat: add Tanstack start support

[CarlosZiegler]

Adds a first-class TanStack Start adapter to the Flags SDK via a new flags/tanstack-start entrypoint, following the same patterns as the existing Next.js and SvelteKit adapters.

What's included

• New entrypoint flags/tanstack-start exporting flag, getProviderData, createFlagsDiscoveryEndpoint, precompute, generatePermutations e os helpers encrypt*/decrypt*.
• Auto request resolution — flags podem ser avaliadas sem argumentos dentro de loaders, server functions e server routes (request resolvida automaticamente via getRequest() do TanStack Start), ou passando um Request explicitamente.
• Vercel Toolbar overrides suportados via cookie vercel-flag-overrides.
• Example app (examples/tanstack-start-example) demonstrando flag via cookie, flags A/B precomputadas com identify, avaliação em route loader e o discovery endpoint do Vercel Toolbar.
• Tests para o entrypoint, request dedupe e precompute.

[vercel]

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​tanstack/​react-router@​1.170.16
	npm/​@​tanstack/​react-start@​1.168.26
	npm/​@​vitejs/​plugin-react@​5.2.0

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[dferber90]

Thank you for contributing! We will need to extract the reusable core logic before we add support for more frameworks. That way we can reduce the maintenance burden a little bit. I started looking into it, but no specific timeline here.