Vercel Flags no longer requires SDK Keys for Vercel deployments

Short summary

Vercel Flags eliminates SDK Key requirements for new Vercel deployments by automatically providing short-lived OIDC tokens at runtime for authentication. Existing projects and use cases like cross-project access, non-Vercel runtimes, and custom authentication workflows still require SDK Keys. Local development is simplified: developers connect via `vercel link` and pull credentials with `vercel env pull`.

• •New Vercel projects get automatic OIDC token authentication (no SDK Key configuration needed)
• •Existing projects unaffected; SDK Keys still required for cross-project access, non-Vercel runtimes, and custom auth
• •Local development simplified to: `vercel link` and `vercel env pull`

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