Sea Bass with Marinated Vegetables

Name: Sea Bass with Marinated Vegetables
Ingredients: 1 ripe medium tomato; 1 garlic clove, smashed; 4 basil leaves; 1 fresh thyme sprig; 6 green olives, such as picholine, pitted and chopped; 12 Niçoise olives, pitted and chopped; 1 tablespoon drained capers; 1 celery rib, peeled and diced; 1/2 small fennel bulb, stalks discarded and bulb diced; 1 small zucchini, diced; 1 red bell pepper, diced; 1 green bell pepper, diced; 1 small onion, diced; About 2 cups extra-virgin olive oil, divided; 1 pinch saffron, crumbled; 1 lemon, peel and pith cut off and lemon quartered and diced; 6 (6-oz) pieces sea bass or striped bass fillet with skin, small bones removed; 1/4 teaspoon fine sea salt; Extra-virgin olive oil for drizzling; 1 teaspoon chopped fresh chives; Coarse sea salt to taste