feat: add financial transactions management for companies

- Implemented a new route for managing financial transactions (money) for companies, including creating, editing, and deleting transactions.
- Added a new model `Buchung` to represent transactions with fields for date, account type, transaction type, amount, and description.
- Updated the `companies` model to include a relation to the new `Buchung` model.
- Enhanced the company overview page to link to the new financial transactions page.
- Added migration scripts to create the necessary database tables and fields for the new functionality.
- Created utility scripts for resetting the admin password and setting up the initial admin user.

prisma/migrations/20260324162325_add_zahlungsart_steuersatz/migration.sql

@@ -0,0 +1,7 @@
+-- AlterTable
+ALTER TABLE `betriebsausgaben` ADD COLUMN `steuersatz` DECIMAL(5, 2) NOT NULL DEFAULT 0,
+    ADD COLUMN `zahlungsart` ENUM('KASSE', 'BANK') NOT NULL DEFAULT 'BANK';
+
+-- AlterTable
+ALTER TABLE `betriebseinnahmen` ADD COLUMN `steuersatz` DECIMAL(5, 2) NOT NULL DEFAULT 0,
+    ADD COLUMN `zahlungsart` ENUM('KASSE', 'BANK') NOT NULL DEFAULT 'BANK';