Fix PDF: Cyrillic filenames (Latin-1→UTF-8), page count via pdf-lib

- Fix multer encoding: decode Latin-1 to UTF-8 for Cyrillic names
- Use pdf-lib instead of pdf-parse for page count (more reliable)
- ignoreEncryption flag for encrypted PDFs

routes/pdf.js

@@ -25,6 +25,16 @@ const upload = multer({
 
 const limiter = rateLimit({ windowMs: 60000, max: 30, message: { error: 'Слишком много запросов' } });
 
+// Fix multer filename encoding (Latin-1 → UTF-8 for Cyrillic)
+function fixFilename(str) {
+  try {
+    const buf = Buffer.from(str, 'latin1');
+    const decoded = buf.toString('utf8');
+    if (/[а-яёА-ЯЁ]/.test(decoded)) return decoded;
+  } catch {}
+  return str;
+}
+
 // File storage for uploaded PDFs
 const pdfFiles = new Map();
 
@@ -33,7 +43,7 @@ function registerFile(multerFile, pageCount) {
   const entry = {
     id,
     path: multerFile.path,
-    name: multerFile.originalname,
+    name: fixFilename(multerFile.originalname),
     size: multerFile.size,
     pages: pageCount || 0,
   };
@@ -68,18 +78,21 @@ router.get('/', (req, res) => {
 router.post('/upload', limiter, upload.array('files', 10), async (req, res) => {
   if (!req.files || !req.files.length) return res.status(400).json({ error: 'Файлы не загружены' });
 
-  const pdfParse = require('pdf-parse');
   const results = [];
 
   for (const file of req.files) {
     let pages = 0;
     try {
-      if (file.mimetype === 'application/pdf') {
+      if (file.mimetype === 'application/pdf' || file.originalname.endsWith('.pdf')) {
         const buf = fs.readFileSync(file.path);
-        const data = await pdfParse(buf);
-        pages = data.numpages || 0;
+        // Use pdf-lib for page count (more reliable than pdf-parse)
+        const { PDFDocument } = await import('pdf-lib');
+        const doc = await PDFDocument.load(buf, { ignoreEncryption: true });
+        pages = doc.getPageCount();
       }
-    } catch {}
+    } catch (e) {
+      log.warn('PDF page count failed', { file: file.originalname, error: e.message });
+    }
     const entry = registerFile(file, pages);
     results.push({ id: entry.id, name: entry.name, size: entry.size, pages });
   }