fix(s02): normalize_messages block type error

[Afeng365]

Problem：
In the normalize_messages method, the code line：
if is instance (block, dict),
block is an object, but here it is judged using a dict

Fix:
When adding content to messages, directly convert the response into a dictionary:
messages.append({"role": "assistant", "content": response.to_dict().get("content")})

[vercel]

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