[fix] better json parsing in openai.py (#913)

Thanks for the contribution\! This fix helps users who use alternative GPT APIs like Moonshot that don't support structured output mode. 🎉

backend/src/module/parser/analyser/openai.py

@@ -104,7 +104,7 @@ class OpenAIParser:
 
         if asdict:
             try:
-                result = json.loads(result)
+                result = json.loads(result[result.index("{"):result.rindex("}") + 1])    # find the first { and last } for better compatibility
             except json.JSONDecodeError:
                 logger.warning(f"Cannot parse result {result} as python dict.")