feat: Chat页面模型选择支持JSON格式的model字段

- parseAgentModels新增支持解析JSON数组格式[{id, name}]
- 模型选择下拉框使用模型id作为value，name作为label展示
- 选择模型时同时设置model_id和model字段
- 发起聊天请求时携带model_id参数
- 兼容旧格式：逗号分隔的字符串

src/pages/ChatPage.tsx

@@ -32,11 +32,31 @@ interface StreamingState {
   toolCalls: ToolCallTrace[];
 }
 
-const parseAgentModels = (value?: string) =>
-  String(value || '')
+interface AgentModelOption {
+  id: string;
+  name: string;
+}
+
+const parseAgentModels = (value?: string): AgentModelOption[] => {
+  if (!value) return [];
+  // 尝试解析 JSON 格式
+  try {
+    const parsed = JSON.parse(value);
+    if (Array.isArray(parsed)) {
+      return parsed.map((item: any) => ({
+        id: typeof item === 'object' ? item.id : String(item),
+        name: typeof item === 'object' ? item.name : String(item)
+      }));
+    }
+  } catch {
+    // 兼容旧格式：逗号分隔的字符串
+  }
+  return String(value || '')
     .split(',')
     .map((item) => item.trim())
-    .filter(Boolean);
+    .filter(Boolean)
+    .map((item) => ({ id: item, name: item }));
+};
 
 export default function ChatPage() {
   const { id } = useParams();
@@ -155,9 +175,14 @@ export default function ChatPage() {
     }
     const a = await AgentAPI.detail(id);
     setAgent(a);
-    const firstModel = parseAgentModels(a.model)[0];
+    const models = parseAgentModels(a.model);
+    const firstModel = models[0];
     if (firstModel) {
-      setOverrides((o) => ({ ...o, model: o.model || firstModel }));
+      setOverrides((o) => ({
+        ...o,
+        model: o.model || firstModel.name,
+        model_id: o.model_id || firstModel.id
+      }));
     }
   };
 
@@ -257,8 +282,9 @@ export default function ChatPage() {
     const ctrl = new AbortController();
     abortRef.current = ctrl;
 
-    const model = overrides.model || parseAgentModels(agent?.model)[0] || '';
-    const modelId = overrides.model_id || '';
+    const models = parseAgentModels(agent?.model);
+    const model = overrides.model || models[0]?.name || '';
+    const modelId = overrides.model_id || models[0]?.id || '';
     const attText = buildAttachmentsText();
     const content = attText ? `${text}\n\n${attText}` : text;
 
@@ -427,7 +453,8 @@ export default function ChatPage() {
     scrollBottom(true);
     const attText = buildAttachmentsText();
     const content = attText ? `${text}\n\n${attText}` : text;
-    const model = overrides.model || parseAgentModels(agent?.model)[0] || '';
+    const models = parseAgentModels(agent?.model);
+    const model = overrides.model || models[0]?.name || '';
     try {
       const res = await ChatAPI.send(
         id,
@@ -612,11 +639,11 @@ export default function ChatPage() {
   const isImageUrl = (url: string) => url?.startsWith('http') || url?.startsWith('/');
   const agentModel = agent?.model || '';
   const agentModels = parseAgentModels(agentModel);
-  const modelOptions = agentModels.map((modelName) => ({
-    value: modelName,
-    label: modelName
+  const modelOptions = agentModels.map((model) => ({
+    value: model.id,
+    label: model.name
   }));
-  const activeModelValue = overrides.model || '';
+  const activeModelValue = overrides.model_id || '';
 
   return (
     <div className="chat-shell">
@@ -928,7 +955,14 @@ export default function ChatPage() {
                     options={modelOptions}
                     suffixIcon={<DownOutlined className="chat-model-select-arrow" />}
                     placeholder="选择模型"
-                    onChange={(value) => setOverrides((o) => ({ ...o, model: String(value) }))}
+                    onChange={(modelId) => {
+                      const selectedModel = agentModels.find((m) => m.id === modelId);
+                      setOverrides((o) => ({
+                        ...o,
+                        model_id: String(modelId),
+                        model: selectedModel?.name || String(modelId)
+                      }));
+                    }}
                   />
 
                   <Upload