Add CRM customer management with edit/delete features

[steve8708]

Added comprehensive customer management functionality to the CRM module:

• Created UserEditModal component with form validation and nested object handling for editing user details including personal information, contact details, and address
• Enhanced Customers page from basic placeholder to full-featured interface with DataGrid displaying user avatars, search functionality, pagination, and CRUD operations
• Added UsersApiService with TypeScript interfaces for complete user API integration including GET, POST, PUT, and DELETE operations
• Implemented real-time search with debouncing, error handling with snackbar notifications, and confirmation dialogs for delete operations
• Integrated Material-UI DataGrid with server-side pagination, custom columns, and action buttons for edit/delete functionality

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