Fix AI mime-type and enable invoice actions

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

@@ -67,12 +67,19 @@ export class GeminiExtractorService {
         Pay close attention to Jordanian Tax Rules (subtotal - discount + tax = grand_total).
       `;
 
+      // Detect MIME type based on extension
+      const ext = path.extname(filePath).toLowerCase();
+      let mimeType = 'image/jpeg';
+      if (ext === '.pdf') mimeType = 'application/pdf';
+      else if (ext === '.png') mimeType = 'image/png';
+      else if (ext === '.webp') mimeType = 'image/webp';
+
       const result = await this.model.generateContent([
         prompt,
         {
           inlineData: {
             data: fileData.toString('base64'),
-            mimeType: 'image/jpeg', // Adjusted based on file extension in prod
+            mimeType: mimeType,
           },
         },
       ]);