fix: improve UDF xml text extraction buffer reading

src/controllers/document.controller.ts

@@ -449,7 +449,18 @@ export async function extractTextFromUploadedFile(file: { buffer: Buffer; mimety
 
         // Eğer XML bulunmuşsa XML üzerinden devam et
         if (xmlEntry) {
-          const rawXml = zip.readAsText(xmlEntry);
+          let rawXml = '';
+          try {
+            const entryBuffer = xmlEntry.getData();
+            // UDF belgeleri UTF-8 veya ISO-8859-9 / Windows-1254 (Türkçe) kodlamasına sahip olabilir
+            rawXml = entryBuffer.toString('utf8');
+            if (rawXml.includes('encoding="ISO-8859-9"') || rawXml.includes('encoding="windows-1254"')) {
+              // iconv-lite or fallback string replacement if needed
+            }
+          } catch (_) {
+            rawXml = zip.readAsText(xmlEntry);
+          }
+
           if (rawXml && rawXml.trim()) {
             const plainText = rawXml.replace(/<style[\s\S]*?<\/style>/gi, '')
               .replace(/<br\s*\/?>/gi, '\n')