refactor: extract Kimi model selector logic to dedicated hook

- Create useKimiModelSelector hook to manage Kimi-specific state
- Auto-detect Kimi providers by preset name or config content
- Support model initialization from existing config in edit mode
- Sync model selections with JSON configuration
- Maintain clean separation between UI and business logic

src/components/providers/forms/hooks/index.ts

@@ -5,3 +5,4 @@ export { useModelState } from "./useModelState";
 export { useCodexConfigState } from "./useCodexConfigState";
 export { useApiKeyLink } from "./useApiKeyLink";
 export { useCustomEndpoints } from "./useCustomEndpoints";
+export { useKimiModelSelector } from "./useKimiModelSelector";