Add sale management feature for admin panel

- Add database migration for sale fields (percentage, active, dates)
- Update API to handle sale operations and bulk updates
- Create SaleManager component for admin interface
- Update FilamentTableV2 to display sale prices on frontend
- Add sale column in admin dashboard
- Implement sale price calculations with strikethrough styling

src/types/filament.ts

@@ -11,4 +11,8 @@ export interface Filament {
   status?: string;
   created_at?: string;  // Using snake_case to match database
   updated_at?: string;  // Using snake_case to match database
+  sale_percentage?: number;
+  sale_active?: boolean;
+  sale_start_date?: string;
+  sale_end_date?: string;
 }