Added:
- Tax Calculation Method feature: Admins can now choose between "price-based" or "income-based" taxation.
- `tax-calculation-method` option in config.yml to determine the tax calculation basis.
- `lastGeneratedIncome` tracking system per apartment to keep tax proportional to the latest earnings.
- Automatic fallback to price-based taxation if an apartment has not generated any income yet.
- Automated Update Checker mechanism integrated with Cloudflare Workers & Supabase.
- Join notifications for administrators when a new plugin version is detected.
- Latest update status and download links displayed in the `/ac version` command output.
- Automatic pruning mechanism for old paid tax invoices (`paidAt > 0`) after 30 days.

Changed:
- Updated config-version from 4 to 5.
- Updated plugin version from 1.3.8 to 1.3.9.
- Optimized tax calculation logic in Apartment.java to prevent imbalances (tax > income).
- Cloudflare Worker now supports the `/api/version` endpoint for plugin metadata.
- Improved "Net Income" display accuracy in Statistics GUIs according to the active tax method.
- Adjusted Tax Overview information in Tax Management GUI to reflect the active calculation basis (income-based / price-based).
- Set Display Name input mechanism in ApartmentDetailsGUI now uses an interactive chat prompt instead of raw chat instructions.
- Solar Panel shop buff effects (tax reduction) are now visible directly in the TaxManagementGUI (Overview, Apartment Tax Info, and Invoice Details).

Click here to view the change log for all plugin versions