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

database/migrations/014_add_sale_fields.sql

@@ -0,0 +1,10 @@
+-- Add sale fields to filaments table
+ALTER TABLE filaments 
+ADD COLUMN IF NOT EXISTS sale_percentage INTEGER DEFAULT 0 CHECK (sale_percentage >= 0 AND sale_percentage <= 100),
+ADD COLUMN IF NOT EXISTS sale_active BOOLEAN DEFAULT FALSE,
+ADD COLUMN IF NOT EXISTS sale_start_date TIMESTAMP WITH TIME ZONE,
+ADD COLUMN IF NOT EXISTS sale_end_date TIMESTAMP WITH TIME ZONE;
+
+-- Add indexes for better performance
+CREATE INDEX IF NOT EXISTS idx_filaments_sale_active ON filaments(sale_active) WHERE sale_active = TRUE;
+CREATE INDEX IF NOT EXISTS idx_filaments_sale_dates ON filaments(sale_start_date, sale_end_date) WHERE sale_active = TRUE;