增加模型选择功能，支持不同 Agent 模型

src/components/chat/hooks/useAgentChatSession.ts

@@ -3,7 +3,7 @@
 import { useCallback, useEffect, useRef, useState } from "react";
 
 import { abortAgentChat, forkAgentChat, streamAgentChat } from "@/lib/chatStream";
-import type { StreamEvent } from "@/lib/chatStream";
+import type { AgentModel, StreamEvent } from "@/lib/chatStream";
 import type {
   AgentArtifact,
   BranchGroup,
@@ -37,6 +37,7 @@ type UseAgentChatSessionOptions = {
     },
   ) => void;
   onBeforeSend?: () => void;
+  getModel?: () => AgentModel;
 };
 
 type PromptRunOptions = {
@@ -137,6 +138,7 @@ const messagesEqual = (left: Message[], right: Message[]) =>
 export const useAgentChatSession = ({
   onToolCall,
   onBeforeSend,
+  getModel,
 }: UseAgentChatSessionOptions) => {
   const storageSessionIdRef = useRef<string | undefined>(undefined);
   const hydrationCompletedRef = useRef(false);
@@ -317,6 +319,7 @@ export const useAgentChatSession = ({
         await streamAgentChat({
           message: prompt,
           sessionId: sessionIdOverride ?? sessionIdRef.current,
+          model: getModel?.(),
           signal: controller.signal,
           onEvent: (event) => {
             if ("sessionId" in event && event.sessionId && event.sessionId !== sessionIdRef.current) {
@@ -448,7 +451,7 @@ export const useAgentChatSession = ({
         setIsStreaming(false);
       }
     },
-    [appendArtifact, isHydrating, isStreaming, messages, onBeforeSend, onToolCall],
+    [appendArtifact, getModel, isHydrating, isStreaming, messages, onBeforeSend, onToolCall],
   );
 
   const abort = useCallback(() => {