Add allow_negative_stock toggle for sales, remissions, quotes, layaways and service orders

pos/static/js/pos.js

@@ -33,6 +33,7 @@ const POS = (() => {
     let canCreateRemission = false;
     let counterRemissionEnabled = false;
     let allowZeroPriceSales = true;
+    let allowNegativeStock = false;
     let currentPerms = [];
     let receiptConfig = {};
     let couriers = [];
@@ -143,12 +144,14 @@ const POS = (() => {
             } catch (e) {
                 counterRemissionEnabled = false;
             }
-            // Sales settings (zero-price sales toggle)
+            // Sales settings (zero-price and negative-stock toggles)
             try {
                 const ssCfg = await api('/pos/api/config/sales-settings');
                 allowZeroPriceSales = ssCfg.allow_zero_price_sales !== false;
+                allowNegativeStock = ssCfg.allow_negative_stock === true;
             } catch (e) {
                 allowZeroPriceSales = true;
+                allowNegativeStock = false;
             }
             // Counter remission workflow applies only to the counter role.
             canCreateRemission = counterRemissionEnabled && employeeRole === 'counter' && perms.includes('pos.remission');