Implement slot management and integrate payment processing endpoints

[vanshwarathe]

Summary

This pull request adds the following backend functionalities:

• Slot Management: Created endpoints to add, update, delete, and retrieve slots for turf booking.
• Payment Integration: Implemented Razorpay-based payment processing logic including payment DTOs, services, and controller methods.

Changes Made

• Added Slot entity, repository, service, controller
• Added TurfPaymentDTO and updated PaymentMethods
• Created payment service to handle Razorpay signature verification
• Integrated payment-related endpoints in the controller
• Connected to MySQL for persistence

Testing

• Tested endpoints using Postman
• Verified Razorpay signature generation and validation
• Confirmed correct data is stored in MySQL

[Shadow2002-hub]

good