TanStack Start scaffolding migrated to @tanstack/cli

Minor Changes

• #14096 a5b7690 Thanks @MattieTK! - Migrate TanStack Start scaffolding from @tanstack/create-start to @tanstack/cli

  TanStack has consolidated their project scaffolding into a unified CLI package (@tanstack/cli) with a create subcommand, replacing the previous @tanstack/create-start package. This updates C3 to use the new CLI while preserving the same Cloudflare deployment target and React framework options.