feat(web): 优化对话界面显示

service-web/client/src/pages/ai/Conversation.tsx

@@ -135,7 +135,7 @@ function Conversation() {
             onRequest({
               message: {
                 role: 'user',
-                content: think ? message : `/no_think ${message}`,
+                content: (!think && message.length === 0) ? `/no_think ${message}` : message,
               },
               stream: true,
             })
@@ -148,7 +148,12 @@ function Conversation() {
               <Flex justify="space-between" align="center">
                 <Flex gap="small" align="center">
                   深度思考
-                  <Switch size="small" value={think} onChange={setThink}/>
+                  <Switch
+                    size="small"
+                    value={think}
+                    onChange={setThink}
+                    disabled={messages.length > 0}
+                  />
                   <Divider type="vertical"/>
                   <Tooltip title="清空对话">
                     <Button