refactor(ThinkChunkMiddleware): remove reasoning check for improved logic clarity (#8505)

- Removed the reasoning check from the ThinkChunkMiddleware to streamline the processing logic.
- This change enhances the middleware's efficiency by focusing on handling streams directly without the reasoning condition.

src/renderer/src/aiCore/middleware/core/ThinkChunkMiddleware.ts

@@ -34,12 +34,6 @@ export const ThinkChunkMiddleware: CompletionsMiddleware =
     if (result.stream) {
       const resultFromUpstream = result.stream as ReadableStream<GenericChunk>
 
-      // 检查是否启用reasoning
-      const enableReasoning = params.enableReasoning || false
-      if (!enableReasoning) {
-        return result
-      }
-
       // 检查是否有流需要处理
       if (resultFromUpstream && resultFromUpstream instanceof ReadableStream) {
         // thinking 处理状态