fix(ai): Improve ModelInfo types based on actual data structure

- Remove catch-all [key: string]: any from ModelInfo
- Make all required fields non-optional (attachment, reasoning, etc.)
- Add proper union types for modalities (text, image, audio, video, pdf)
- Mark only cost and knowledge fields as optional
- Export ModalityInput and ModalityOutput types

packages/ai/src/index.ts

@@ -10,6 +10,8 @@ export {
 	getProviderInfo,
 	getProviderModels,
 	loadModels,
+	type ModalityInput,
+	type ModalityOutput,
 	type ModelInfo,
 	type ModelsData,
 	type ProviderInfo,