✨ Feat: Invoice viewing, JoFotara UBL refinements, delete functionality, and tax rate validation

backend/src/modules/invoices/gemini-extractor.service.ts

@@ -63,8 +63,13 @@ export class GeminiExtractorService {
             }
           ]
         }
+        Pay close attention to Jordanian Tax Rules:
+        - Standard Rate: 0.16 (16%)
+        - Reduced Rate: 0.04 (4%)
+        - Zero Rate: 0.00 (0%)
+        - Exempt: null or 0 with explanation.
+        - The formula MUST hold: Subtotal - Discount + Tax = Grand Total.
         Return ONLY the JSON. No markdown formatting. If a field is missing, return null. 
-        Pay close attention to Jordanian Tax Rules (subtotal - discount + tax = grand_total).
       `;
 
       // Detect MIME type based on extension