Corn Fritters with Spicy Zucchini Salsa

Name: Corn Fritters with Spicy Zucchini Salsa
Ingredients: 1 1/2 cups cherry tomatoes, halved lengthwise; 1 1/2 cups diced zucchini; 1 medium red onion, diced, divided; 3 large cloves garlic, finely chopped; 1 jalapeño chile, seeded and diced; 1/2 teaspoon sea salt, divided; 1 1/2 tablespoons extra-virgin olive oil; Olive oil cooking spray; 1/2 cup chopped cilantro, divided; 2 tablespoons fresh lime juice, divided; 1 cup all-purpose flour; 1/2 teaspoon ground cumin; 1/4 teaspoon baking powder; 1 egg; 2 cups corn kernels (thawed if frozen)