Spiced Salmon Noodle Soup

Name: Spiced Salmon Noodle Soup
Ingredients: 2 Tbsp. extra-virgin olive oil; ½ medium head of Napa cabbage, coarsely chopped; 1 medium onion, halved; 1 medium apple, peeled, cored, cut into ½ pieces; 1 large carrot, peeled, coarsely chopped; 1 celery stalk, coarsely chopped; 1 1 piece ginger, peeled, thinly sliced; 3 garlic cloves, smashed; 1 salmon head, preferably wild, gills removed, rinsed, halved (optional); 2 lb. salmon scraps, such as backbone and/or fillet scraps, rinsed; 1 3-long cinnamon stick; 3 whole star anise; 1 tsp. coriander seeds; 1 tsp. fennel seeds; 1 8-oz. bottle clam juice; Juice of 2 limes; ¼ cup hoisin sauce; ¼ cup soy sauce; 1 Tbsp. sriracha or chili-garlic sauce (optional); 1 Tbsp. toasted sesame oil; 8 oz. wide rice noodles or rice vermicelli; 4 3-oz. skin-on salmon fillets, preferably wild; ½ tsp. ground cinnamon; Kosher salt; 1 Tbsp. extra-virgin olive oil; ½ medium onion, thinly sliced; 1 medium carrot, peeled, cut into matchsticks; 1 cup thinly sliced leafy greens (such as bok choy, Napa cabbage, or Swiss chard); Bean sprouts, Thai or sweet basil leaves, cilantro leaves with tender stems, and/or sliced jalapeño (for serving)