This update enhances the capability of the billing system to handle different types of billing modes (subscription-based or one-time payments) and introduces an environment variable for configuring the preferred billing mode. It also refactors the data fetching process in the `loadPersonalAccountBillingPageData` and `loadTeamAccountBillingPageData` to retrieve the proper data depending on the chosen billing mode. Detailed documentation was added in README.md to guide the configuration of the billing schema.
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