[Gas card exchange for U] Group purchase + transaction area operator-level card issuance source code

Function introduction:
1. Add group buying and group opening function
2. Add the free resale function in the trading area
3. Recharge is changed to U interface (with background review)
4.Three languages (not perfect)
5. Limit points + balance to purchase goods and quantity
6. Fix the problem of useless front and back functions and lag caused by calling invalid js
Backend: Domain name houtai
Account admin123 password 123456