fix: allow parapharmacy sources in pharmacy-products endpoint

Updated validation to accept: cima, promofarma, docmorris, primor, parapharmacy

Before: product_source must be 'cima'
After: product_source must be one of: cima, promofarma, docmorris, primor, parapharmacy

apps/backend/server.js

@@ -2125,8 +2125,10 @@ app.post('/api/admin/pharmacy-products', requireAdmin, async (req, res) => {
       return res.status(400).json({ error: 'pharmacy_id, product_source, and product_off_id are required' });
     }
 
-    if (product_source !== 'cima') {
-      return res.status(400).json({ error: 'product_source must be "cima"' });
+    // Allow both CIMA and parapharmacy sources
+    const validSources = ['cima', 'promofarma', 'docmorris', 'primor', 'parapharmacy'];
+    if (!validSources.includes(product_source)) {
+      return res.status(400).json({ error: `product_source must be one of: ${validSources.join(', ')}` });
     }
 
     const existing = await userDbGet(