feat: enhance AI core functionality with smoothStream integration

- Added smoothStream to the middleware exports in index.ts for improved streaming capabilities.
- Updated PluginEnabledAiClient to conditionally apply middlewares, removing the default simulateStreamingMiddleware.
- Modified ModernAiProvider to utilize smoothStream in streamText, enhancing text processing with configurable chunking and delay options.

packages/aiCore/src/clients/PluginEnabledAiClient.ts

@@ -19,14 +19,7 @@
  * })
  * ```
  */
-import {
-  generateObject,
-  generateText,
-  LanguageModelV1Middleware,
-  simulateStreamingMiddleware,
-  streamObject,
-  streamText
-} from 'ai'
+import { generateObject, generateText, LanguageModelV1Middleware, streamObject, streamText } from 'ai'
 
 import { AiPlugin, createContext, PluginManager } from '../plugins'
 import { isProviderSupported } from '../providers/registry'
@@ -196,7 +189,7 @@ export class PluginEnabledAiClient<T extends ProviderId = ProviderId> {
       this.providerId,
       modelId,
       this.options,
-      middlewares.length > 0 ? middlewares : [simulateStreamingMiddleware()] //TODO: 这里需要改成非流时调用simulateStreamingMiddleware()，这里先随便传一个
+      middlewares.length > 0 ? middlewares : undefined
     )
   }
 

packages/aiCore/src/index.ts

@@ -79,7 +79,7 @@ export type {
   ToolExecutionError,
   ToolResult
 } from 'ai'
-export { defaultSettingsMiddleware, extractReasoningMiddleware, simulateStreamingMiddleware } from 'ai'
+export { defaultSettingsMiddleware, extractReasoningMiddleware, simulateStreamingMiddleware, smoothStream } from 'ai'
 
 // 重新导出所有 Provider Settings 类型
 export type {

src/renderer/src/aiCore/index_new.ts

@@ -14,6 +14,7 @@ import {
   createClient,
   type OpenAICompatibleProviderSettings,
   type ProviderId,
+  smoothStream,
   StreamTextParams
 } from '@cherrystudio/ai-core'
 import { isDedicatedImageGenerationModel } from '@renderer/config/models'
@@ -176,7 +177,13 @@ export default class ModernAiProvider {
       if (middlewareConfig.onChunk) {
         // 流式处理 - 使用适配器
         const adapter = new AiSdkToChunkAdapter(middlewareConfig.onChunk)
-        const streamResult = await clientWithMiddlewares.streamText(modelId, params)
+        const streamResult = await clientWithMiddlewares.streamText(modelId, {
+          ...params,
+          experimental_transform: smoothStream({
+            delayInMs: 100,
+            chunking: 'word'
+          })
+        })
         const finalText = await adapter.processStream(streamResult)
 
         return {