[Bug] Token usage not working when using MoonshotAI official API

[Soulter]

What happened / 发生了什么

MoonshotAI official API does not use standard OpenAI API in token usage.

Received chunk: ChatCompletionChunk(id='chatcmpl-69bbcc292af1bf47c1d8a74b', choices=[Choice(delta=ChoiceDelta(content=' name', function_call=None, refusal=None, role=None, tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1773915177, model='kimi-k2-0905-preview', object='chat.completion.chunk', service_tier=None, system_fingerprint='fpv0_e76aa377', usage=None)
Received chunk: ChatCompletionChunk(id='chatcmpl-69bbcc292af1bf47c1d8a74b', choices=[Choice(delta=ChoiceDelta(content='?', function_call=None, refusal=None, role=None, tool_calls=None), finish_reason=None, index=0, logprobs=None)], created=1773915177, model='kimi-k2-0905-preview', object='chat.completion.chunk', service_tier=None, system_fingerprint='fpv0_e76aa377', usage=None)
Received chunk: ChatCompletionChunk(id='chatcmpl-69bbcc292af1bf47c1d8a74b', choices=[Choice(delta=ChoiceDelta(content=None, function_call=None, refusal=None, role=None, tool_calls=None), finish_reason='stop', index=0, logprobs=None, usage={'prompt_tokens': 1336, 'completion_tokens': 31, 'total_tokens': 1367, 'cached_tokens': 1280, 'prompt_tokens_details': {'cached_tokens': 1280}})], created=1773915177, model='kimi-k2-0905-preview', object='chat.completion.chunk', service_tier=None, system_fingerprint='fpv0_e76aa377', usage=None)

Reproduce / 如何复现？

Using MoonshotAI API(official)

AstrBot version, deployment method (e.g., Windows Docker Desktop deployment), provider used, and messaging platform used. / AstrBot 版本、部署方式（如 Windows Docker Desktop 部署）、使用的提供商、使用的消息平台适配器

OS

Linux

Logs / 报错日志

Are you willing to submit a PR? / 你愿意提交 PR 吗？

• Yes!

Code of Conduct

• I have read and agree to abide by the project's Code of Conduct。