Fix vision OCR response parsing for dict-returning ollama client versions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent_service/tools/receipt_parser.py

@@ -117,7 +117,10 @@ def _ocr_image_vision(data: bytes, filename: str, ollama_url: str, model: str) -
                 'images': [data],
             }],
         )
-        text = (response.message.content or '').strip()
+        if isinstance(response, dict):
+            text = (response.get('message', {}).get('content') or '').strip()
+        else:
+            text = (response.message.content or '').strip()
         logger.debug('Vision OCR %s (%s): %d chars', filename, model, len(text))
         return text
     except ImportError: