Add CRM customer management table with search and sort

[steve8708]

Implements a new customer management table component for the CRM section with the following features:

• Responsive data table showing customer information
• Search functionality with debounced input
• Sortable columns with dropdown selector
• Pagination support
• Loading states and error handling
• Integration with Builder.io user API
• Edit customer action button (modal integration)

The implementation includes:

• New CrmCustomersTable component
• New CrmCustomersToolbar component
• Updated Customers page to use the new table

All components follow MUI v7 patterns and existing project structure.

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