feat: Payment system with voucher cards.

feat: Design with inversion dependency injection architecture.
feat: Prettier http middleware.
feat: Re-write items categories with preferred accounts.

server/src/interfaces/ItemCategory.ts

@@ -0,0 +1,30 @@
+
+
+
+export interface IItemCategory {
+  name: string,
+
+  parentCategoryId?: number,
+  description?: string,
+  userId: number,
+
+  costAccountId?: number,
+  sellAccountId?: number,
+  inventoryAccountId?: number,
+
+  costMethod?: string,
+};
+
+export interface IItemCategoryOTD {
+  name: string,
+
+  parentCategoryId?: number,
+  description?: string,
+  userId: number,
+
+  costAccountId?: number,
+  sellAccountId?: number,
+  inventoryAccountId?: number,
+
+  costMethod?: string,
+};