Correct format of data to send at services endpoint to create node
In the html code of node add form as provided by you, title field has name "title_field[und][0][value]". You have to use exactly this name/key in your POST request. Along with that, you also need to send a value with name/key "title". Both needs to be sent. However the value of "title_field[und][0][value]" will be filled as title in the created node.