Create Unallocated Item Request Mutation

[kavinphan]

Description

Create a POST route handler at /api/unallocatedItems that accepts form data and creates an UnallocatedItemRequest record using the form data. The form data will include the following fields: unallocatedItemId, priority, quantity, and comment.

Success Criteria

• 401 if no session
• 403 if user is not a PARTNER
• 404 if the unallocated item does not exist
• The form data is validated using a zod schema
• An UnallocatedItemRequest record is created
• The route handler is documented with a description of its function, parameters, and responses
• There is a test file that covers the success criteria