Two targeted fixes to close the Kimi/Moonshot reasoning gap:
1. chat.rs: add ApiProvider::Moonshot to provider_accepts_reasoning_content
so Kimi thinking traces stream as Thinking blocks instead of leaking
as plain answer text on Moonshot's native endpoint.
2. models.rs: add kimi-* prefix match to model_supports_reasoning so
bare Moonshot-native IDs (kimi-k2.6, kimi-*-thinking, etc.) are
recognized as reasoning-capable without requiring the OpenRouter-style
moonshotai/ prefix.
These two changes together ensure is_reasoning_model_for_stream returns
true for Kimi models on Moonshot, fixing the RC dialet gap.
Hunter Bown
7c4d359ed7