Code for billing services has been refactored for simplicity and improved organization. This includes updated locations for the 'loadTeamWorkspace' function and adjusted component imports. Redundant scripts have been eliminated and new schemas have been introduced for input data validation.
Changed the billing provider in the `.env.development` file from Stripe to Lemon Squeezy. This requires adaptations at many levels: at the web app to load Lemon Squeezy's script in the checkout process, at the billing gateway to handle Lemon Squeezy calls, and in the database to reflect the current billing provider. The checkout process is now done using Lemon Squeezy Sessions and its billing strategy was adjusted accordingly. Billing-related components and services were also updated.
