fix: change input placeholder

src/pages/chat/components/ChatInputH5.tsx

@@ -226,7 +226,7 @@ export default function ChatInputH5(props: {
           ref={inputRef}
           value={input}
           onChange={handleInputChange}
-          placeholder="发消息或按住说话..."
+          placeholder="输入问题，可@其他智能体"
           autoSize={{ minRows: 1, maxRows: 5 }}
           variant="borderless"
           className="chat-input-h5-textarea"