feat: server side validation implemented

[ADARSHsri2004]

Description

Implemented server-side request validation using Zod to ensure data integrity and prevent malformed inputs across API endpoints.

Key Highlights

• Added centralized validateRequest middleware for schema-based validation.
• Created validation schemas in src/validation/:
  • userValidation.ts → Register and Login routes
  • cartValidation.ts → Add, Update, Remove, Checkout Cart
  • productValidation.ts → Create, Update, Delete, and Fetch Products
• Integrated middleware in all respective route files:

Semver Changes

• Patch (bug fix, no new features)
• Minor (new features, no breaking changes)
• Major (breaking changes)

Issues

Closes #33

Checklist

• I have read the Contributing Guidelines.

[04shubham7]

@ADARSHsri2004 can you add ss of live project

[ADARSHsri2004]

@04shubham7 i have added ss