Bug fix: Fix RuntimeError in predict_no_ui_long_connection()
In the original code, calling predict_no_ui_long_connection() would trigger a RuntimeError("OpenAI拒绝了请求：" + error_msg) even when the server responded normally. The issue occurred due to incorrect handling of SSE protocol comment lines (lines starting with ":").
Modified the parsing logic in both `predict` and `predict_no_ui_long_connection` to handle these lines correctly, making the logic more intuitive and robust.
