Updated various package dependencies including "next", "turbo" and "@kit" packages. Moved some dependencies to devDependencies for better project structure. This aims to optimize the dependency graph, reduce unnecessary installation of packages, and enhance the overall development environment.
This commit updates various components in the billing flow due to a new schema that supports multiple line items per plan. The added flexibility rendered 'line-items-mapper.ts' redundant, which has been removed. Additionally, webhooks have been created for handling account membership insertions and deletions, as well as handling subscription deletions when an account is deleted. This message also introduces a new service to handle sending out invitation emails. Lastly, the validation of the billing provider has been improved for increased security and stability.
