Chef John's Cheese Blintzes
1 cup all-purpose flour 1 cup milk 1 large egg 1 lemon, zested 1 pinch salt 1 tablespoon butter, or as needed 1 tablespoon confectioners' sugar, or as need… 1 tablespoon white sugar 1 ½ cups ricotta cheese, strained if wet 2 tablespoons confectioners' sugar 2 tablespoons vegetable oil 3 large eggs ¼ cup cold water ¼ teaspoon vanilla extract ½ cup cream cheese ½ teaspoon salt