feat(expenses): add beloPrice and usdcEquivalent fields to Expense model and update related logic

apps/frontend/src/lib/api.ts

@@ -130,6 +130,8 @@ export type Expense = {
   month: number;
   amount: string;
   amountPayed: string | null;
+  beloPrice: string | null;
+  usdcEquivalent: string | null;
   status: "PENDING" | "PAYED";
   dueDate: string;
   paymentDate: string | null;