In a medium bowl, toss the cherry tomatoes with the tomato marinade ingredients. Set aside to marinate for at least 15 minutes.
In a small bowl, toss the artichoke hearts with the olive oil, lemon juice, salt, and pepper. Set aside.
Make the vinaigrette: in a jar or small bowl, combine the lemon juice, red wine vinegar, shallot, garlic, olive oil, salt, pepper, and oregano. Whisk or shake well to combine. Taste and adjust seasoning as needed.
Make the butter-toasted panko: heat the olive oil in a small skillet over medium heat. Add the panko and cook, stirring frequently, until golden and crispy, about 3 to 4 minutes. Remove from heat, stir in the fresh oregano, and season lightly with salt. Set aside.
In a large bowl, combine the sliced lettuce and radicchio with the marinated tomatoes, chickpeas, pearl mozzarella, provolone, salami, Castelvetrano olives, marinated artichoke hearts, and pepperoncini.
Season lightly with salt and pepper. Add about half the vinaigrette and toss well to coat. Taste and add more dressing as needed.
Transfer to a large serving platter or bowl and top generously with the butter-toasted panko. Serve immediately.