fix: guard paddleocr confidence parsing

app.py

@@ -194,8 +194,12 @@ def ocr_and_parse(image: Image.Image) -> Dict[str, Any]:
                     text = str(text_info)
             elif len(entry) >= 3:
                 text = entry[1] or ""
-                if entry[2] is not None:
-                    confidence = float(entry[2])
+                raw_conf = entry[2]
+                try:
+                    if raw_conf is not None:
+                        confidence = float(raw_conf)
+                except (TypeError, ValueError):
+                    confidence = 1.0
 
             cleaned = text.strip()
             if not cleaned: