Erster commit wie von Claude erstellt (unverändert)

server/middleware/upload.js

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+import multer from 'multer';
+import path from 'path';
+import fs from 'fs';
+
+const storage = multer.diskStorage({
+  destination: (req, file, cb) => {
+    const rezeptnummer = req.body.rezeptnummer || req.params.rezeptnummer;
+    const rNummer = 'R' + String(rezeptnummer).padStart(3, '0');
+    const uploadPath = path.join('uploads', rNummer);
+    
+    if (!fs.existsSync(uploadPath)) {
+      fs.mkdirSync(uploadPath, { recursive: true });
+    }
+    
+    cb(null, uploadPath);
+  },
+  filename: (req, file, cb) => {
+    const rezeptnummer = req.body.rezeptnummer || req.params.rezeptnummer;
+    const rNummer = 'R' + String(rezeptnummer).padStart(3, '0');
+    const uploadPath = path.join('uploads', rNummer);
+    
+    const existingFiles = fs.readdirSync(uploadPath).filter(f => f.startsWith(rNummer));
+    const nextIndex = existingFiles.length;
+    
+    const filename = `${rNummer}_${nextIndex}.jpg`;
+    cb(null, filename);
+  }
+});
+
+const fileFilter = (req, file, cb) => {
+  const allowedTypes = ['image/jpeg', 'image/jpg', 'image/png'];
+  if (allowedTypes.includes(file.mimetype)) {
+    cb(null, true);
+  } else {
+    cb(new Error('Nur JPG, JPEG und PNG Dateien erlaubt'), false);
+  }
+};
+
+export const upload = multer({
+  storage,
+  fileFilter,
+  limits: { fileSize: 10 * 1024 * 1024 } // 10MB
+});