Add complete customer management system to CRM

[steve8708]

Added comprehensive customer management functionality to the CRM module including:

• Created customer type definitions with TypeScript interfaces for API integration
• Added useCustomers hook for managing customer data operations and API calls
• Implemented CreateCustomerDialog component for adding new customers with form validation
• Added CustomerDetailsDialog component for viewing and editing customer information
• Enhanced Customers page with full DataGrid interface, search, sorting, pagination, and CRUD operations
• Integrated with Builder.io Users API for data persistence
• Added Material-UI components for consistent UI design and user experience

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