V2.0.6 Added purchase management, transfer order, inventory counting functions

1. [Purchase] Newly added procurement management, supporting the creation of purchase orders and supplier management

1) Support the creation of purchases. After all the SKUs in the purchase order are received, the warehouse inventory corresponding to the SKU will be automatically increased

2) Support the creation of suppliers. Create and manage supplier information in ShopHub

2. [Inventory] Added counts and transfer functions

1) Counts: Support the inventory of the existing quantity of products in the physical warehouse and compare the inventory of the warehouse to accurately understand the sales situation of the warehouse

2) Transfer order: support the adjustment of SKU quantity between warehouses in ShopHub, and form a transfer order to record the transfer process