增加模型选择功能，支持不同 Agent 模型

src/lib/chatStream.ts

@@ -1,6 +1,10 @@
 import { apiFetch } from "@/lib/apiFetch";
 import { config } from "@config/config";
 
+export type AgentModel =
+  | "deepseek/deepseek-v4-flash"
+  | "deepseek/deepseek-v4-pro";
+
 export type StreamEvent =
   | { type: "token"; sessionId: string; content: string }
   | { type: "done"; sessionId: string; totalDurationMs?: number }
@@ -35,6 +39,7 @@ export type StreamEvent =
 type StreamOptions = {
   message: string;
   sessionId?: string;
+  model?: AgentModel;
   signal?: AbortSignal;
   onEvent: (event: StreamEvent) => void;
 };
@@ -85,6 +90,7 @@ const resolveToolParams = (
 export const streamAgentChat = async ({
   message,
   sessionId,
+  model,
   signal,
   onEvent,
 }: StreamOptions) => {
@@ -102,6 +108,7 @@ export const streamAgentChat = async ({
         body: JSON.stringify({
           message,
           session_id: sessionId,
+          model,
         }),
         projectHeaderMode: "include",
         userHeaderMode: "include",