feat: 模型库能力默认模型UI + 前台Auto默认模型 + AGNES直连修复 + 意图识别增强

frontend/src/pages/front/ChatPage.tsx

@@ -307,7 +307,7 @@ const ChatPage: React.FC = () => {
   const { id } = useParams<{ id?: string }>();
   const navigate = useNavigate();
   const [searchQuery, setSearchQuery] = useState('');
-  const [selectedModelId, setSelectedModelId] = useState('');
+  const [selectedModelId, setSelectedModelId] = useState('auto');
   const [chatModels, setChatModels] = useState<any[]>([]);
   const [inputValue, setInputValue] = useState('');
   const [sending, setSending] = useState(false);
@@ -339,7 +339,7 @@ const ChatPage: React.FC = () => {
       const models = Array.isArray(data) ? data : (data?.items || []);
       setChatModels(models);
       if (models.length > 0 && !selectedModelId) {
-        setSelectedModelId(models[0].id);
+        setSelectedModelId('auto');
       }
     }).catch(() => {
       setChatModels([]);
@@ -463,8 +463,12 @@ const ChatPage: React.FC = () => {
     return [...pinned.filter(c => c.title.toLowerCase().includes(q)), ...unpinned.filter(c => c.title.toLowerCase().includes(q))];
   }, [conversations, searchQuery]);
 
-  // Selected model info
-  const selectedModel = chatModels.find(m => m.id === selectedModelId) || chatModels[0] || { id: '', name: '选择模型', status: 'free', provider_name: '' };
+  // Selected model info（Auto 自动：按对话意图自动匹配后台各能力默认模型）
+  const isAutoModel = selectedModelId === 'auto';
+  const AUTO_MODEL = { id: 'auto', name: 'Auto 自动', status: 'free', provider_name: '按能力智能匹配', capabilities: [], price_per_million_tokens: 0 };
+  const selectedModel = isAutoModel
+    ? AUTO_MODEL
+    : (chatModels.find(m => m.id === selectedModelId) || chatModels[0] || AUTO_MODEL);
 
   // Scroll to bottom when messages change
   useEffect(() => {
@@ -481,7 +485,7 @@ const ChatPage: React.FC = () => {
   // Handle new conversation
   const handleNewConversation = async () => {
     try {
-      const res = await chatAPI.createConversation({ title: '新对话', model_id: selectedModelId });
+      const res = await chatAPI.createConversation({ title: '新对话', model_id: selectedModelId === 'auto' ? (chatModels[0]?.id || '') : selectedModelId });
       const newConv = unwrapData(res);
       const conv: Conversation = {
         id: newConv.id,
@@ -792,6 +796,17 @@ const ChatPage: React.FC = () => {
                     </div>
                   }
                 >
+                  <button
+                    key="auto"
+                    className={`dropdown-item ${selectedModelId === 'auto' ? 'selected' : ''}`}
+                    onClick={() => setSelectedModelId('auto')}
+                  >
+                    <div className="model-dropdown-item">
+                      <span>🤖 Auto 自动</span>
+                      <span className="model-provider-tag">按能力智能匹配</span>
+                      <span className="model-cap-badge">智能</span>
+                    </div>
+                  </button>
                   {chatModels.filter(m => m.is_enabled !== false).map(model => (
                     <button
                       key={model.id}