Salmon Sushi Bowls

Name: Salmon Sushi Bowls
Ingredients: 1 pound cucumbers, preferably seedless; 3 tablespoons rice vinegar; 2 tablespoons cooking oil; 1 teaspoon kosher salt, divided; 1/2 teaspoon sugar; 3 tablespoons mayonnaise; 3 tablespoons Gochujang sauce, more or less to taste; 1/2 cup plain Greek yogurt; 1 1/2 pounds salmon; black pepper; 4 green onions, finely chopped; furikake or toasted white sesame seeds, for serving ((see note)); cooked sushi, white, or brown rice, for serving; seaweed snacks, for serving