fix: tolerate non-numeric paddleocr boxes

app.py

@@ -205,7 +205,11 @@ def ocr_and_parse(image: Image.Image) -> Dict[str, Any]:
             if not cleaned:
                 continue
             lines.append(cleaned)
-            box_serializable = np.asarray(bbox, dtype=float).tolist()
+            try:
+                box_arr = np.asarray(bbox, dtype=float)
+                box_serializable = box_arr.tolist()
+            except (TypeError, ValueError):
+                box_serializable = None
             segments.append({
                 "text": cleaned,
                 "confidence": float(confidence),