Enhance ESLint configuration and improve code consistency

- Added '@typescript-eslint/no-unused-vars' rule to ESLint configuration for better variable management in TypeScript files.
- Updated database.ts to ensure consistent logging format.
- Refactored AuthController and CashflowController to improve variable naming and maintainability.
- Added spacing for better readability in multiple controller methods.
- Adjusted error handling in middleware and repository files for improved clarity.
- Enhanced various service and repository methods to ensure consistent return types and error handling.
- Made minor formatting adjustments across frontend components for improved user experience.

frontend-web/src/components/ui/button.tsx

@@ -1,3 +1,4 @@
+/* eslint-disable react-refresh/only-export-components */
 import * as React from 'react';
 import {Slot} from '@radix-ui/react-slot';
 import {cva, type VariantProps} from 'class-variance-authority';