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/services/api.ts

@@ -87,6 +87,17 @@ export const filamentService = {
     const response = await api.delete(`/filaments/${id}`);
     return response.data;
   },
+  
+  updateBulkSale: async (data: {
+    filamentIds?: string[];
+    salePercentage: number;
+    saleStartDate?: string;
+    saleEndDate?: string;
+    enableSale: boolean;
+  }) => {
+    const response = await api.post('/filaments/sale/bulk', data);
+    return response.data;
+  },
 };
 
 export default api;