feat: 从iframe对接模型配置

frontend-web/src/pages/iframe-chat-submit.test.ts

@@ -79,3 +79,24 @@ test("keeps screenshot-only iframe submissions in the conversation flow", () =>
   assert.equal(result.files[0]?.filename, "shot.jpg");
   assert.equal(result.files[0]?.mediaType, "image/jpeg");
 });
+
+test("maps iframe model selection into stream context model_name", () => {
+  const result = parseBrainyChatSubmitMessage({
+    source: "brainy-extension",
+    type: "brainy:chat-submit",
+    requestId: "iframe-456",
+    payload: {
+      text: "帮我总结这个页面",
+      model: {
+        label: "Qwen3-32B: 效果与速度均衡（推荐）",
+        value: "OpenAI3",
+      },
+    },
+  });
+
+  assert.equal(result.submitText, "帮我总结这个页面");
+  assert.deepEqual(result.iframeContext, {
+    brainy_request_id: "iframe-456",
+    model_name: "OpenAI3",
+  });
+});