feat: Update message handling to include optional uiMessages parameter

- Modify BaseParams type to make uiMessages optional.
- Refactor message preparation in HomeWindow and ActionUtils to handle modelMessages and uiMessages separately.
- Ensure compatibility with updated message structures in fetchChatCompletion calls.

src/renderer/src/types/index.ts

@@ -1307,7 +1307,7 @@ type BaseParams = {
   options?: FetchChatCompletionOptions
   onChunkReceived: (chunk: Chunk) => void
   topicId?: string // 添加 topicId 参数
-  uiMessages: Message[]
+  uiMessages?: Message[]
 }
 
 type MessagesParams = BaseParams & {

src/renderer/src/windows/mini/home/HomeWindow.tsx

@@ -266,13 +266,17 @@ const HomeWindow: FC<{ draggable?: boolean }> = ({ draggable = true }) => {
         newAssistant.webSearchProviderId = undefined
         newAssistant.mcpServers = undefined
         newAssistant.knowledge_bases = undefined
-        const llmMessages = await ConversationService.prepareMessagesForModel(messagesForContext, newAssistant)
+        const { modelMessages, uiMessages } = await ConversationService.prepareMessagesForModel(
+          messagesForContext,
+          newAssistant
+        )
 
         await fetchChatCompletion({
-          messages: llmMessages,
+          messages: modelMessages,
           assistant: newAssistant,
           options: {},
           topicId,
+          uiMessages: uiMessages,
           onChunkReceived: (chunk: Chunk) => {
             switch (chunk.type) {
               case ChunkType.THINKING_START:

src/renderer/src/windows/selection/action/components/ActionUtils.ts

@@ -64,12 +64,13 @@ export const processMessages = async (
     newAssistant.webSearchProviderId = undefined
     newAssistant.mcpServers = undefined
     newAssistant.knowledge_bases = undefined
-    const llmMessages = await ConversationService.prepareMessagesForModel([userMessage], newAssistant)
+    const { modelMessages, uiMessages } = await ConversationService.prepareMessagesForModel([userMessage], newAssistant)
 
     await fetchChatCompletion({
-      messages: llmMessages,
+      messages: modelMessages,
       assistant: newAssistant,
       options: {},
+      uiMessages: uiMessages,
       onChunkReceived: (chunk: Chunk) => {
         if (finished) {
           return