chore(angular-react): Migrate Item model interface to React

[devin-ai-integration]

Summary

Migrates the Item model interface from the Angular location (src/app/shop/domain/item.model.ts) to a React-compatible location (src/types/item.ts). This is a 1:1 migration of a simple TypeScript interface with three string properties: name, description, and price.

The original Angular interface is intentionally preserved per the migration playbook guidelines.

Review & Testing Checklist for Human

• Verify the new interface at src/types/item.ts matches the original at src/app/shop/domain/item.model.ts (should be identical properties)
• Confirm the src/types/ directory location is appropriate for your React migration strategy

Notes

• The price property is typed as string (not number) - this matches the original Angular interface
• Local tests could not be run due to Node.js version incompatibility with Angular 12 (OpenSSL error), but this change is additive and doesn't affect existing code
• Original Angular file is kept per playbook's "Forbidden Actions" (do not remove Angular components)

Link to Devin run: https://app.devin.ai/sessions/5cd93b8c949a44fb97d4a64e592e3ddb
Requested by: @milind-cognition

[devin-ai-integration]

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