feat: rename 'fee' to 'unitPrice' across purchase components and models

- Updated form component to use 'unitPrice' instead of 'fee'.
- Adjusted product charge row form fields and templates to reflect the new naming.
- Modified receipt template and related components to utilize 'unitPrice'.
- Changed models and interfaces to replace 'fee' with 'unitPrice'.
- Updated supplier invoice and statistics components to align with the new naming convention.
- Added new API routes for dashboard and statistics modules.

src/app/modules/cardex/models/io.d.ts

@@ -4,7 +4,7 @@ export interface ICardexRawResponse {
   id: number;
   type: string;
   quantity: number;
-  fee: number;
+  unitPrice: number;
   totalCost: number;
   referenceType: string;
   referenceId: string;