fix(ApiService): 使FetchChatCompletionOptions参数变为可选

为了增加接口的灵活性，将options参数改为可选

src/renderer/src/services/ApiService.ts

@@ -83,7 +83,7 @@ export type FetchChatCompletionOptions = {
 
 type BaseParams = {
   assistant: Assistant
-  options: FetchChatCompletionOptions
+  options?: FetchChatCompletionOptions
   onChunkReceived: (chunk: Chunk) => void
   topicId?: string // 添加 topicId 参数
 }