Refactor budget storage utils

Splits the budget storage utils file into smaller, more manageable files for better organization and maintainability.

src/hooks/useDataInitialization.ts

@@ -1,6 +1,6 @@
 
 import { useState, useEffect, useCallback } from 'react';
-import { resetAllData } from '@/contexts/budget/storageUtils';
+import { resetAllData } from '@/contexts/budget/storage';
 import { resetAllStorageData } from '@/utils/storageUtils';
 
 export const useDataInitialization = (resetBudgetData?: () => void) => {