The devastated mom of the 17-year-old fatally stabbed outside a Bronx apartment building wants justice for her son – who she says was simply in the wrong place at the wrong time when he was savagely killed. Jonathan Melo’s grieving mother, Raquel, told The Post her ambitious and spirited son was eager to graduate high school and pursue a career in real estate to help get her “out of the hood” before his life was tragically cut short when a stranger knifed him in the back Wednesday afternoon.  “From my knowledge my son was at the wrong place at the wrong time,” Raquel said Thursday in an emotional interview outside her Soundview home. Raquel Melo, mother of Jonathan Melo, the 17-year-old fatally stabbed Wednesday afternoon. Estrella McDaniel for NY Post “Jonathan was so full of life. He was the clown of the house, he was so vivacious. He always wanted to be active and loved basketball. He loved working out.…