Khao Soi Northern Thai Coconut Curry Chicken Soup

Name: Khao Soi (Northern Thai Coconut-Curry Chicken Soup)
Ingredients: For the curry paste:; 4 shallots, sliced; 8 cloves garlic; 2 kaffir lime leaves; 1 teaspoon whole coriander seeds; 1 small bunch coriander stems; one 2-inch piece fresh ginger, sliced; one 1-inch piece fresh turmeric, roughly chopped; 1 teaspoon ground cayenne; 2 green cardamon pods (or 1/2 teaspoon black whole cardamom); 2 teaspoons dried lemongrass, rehydrated; 1/2 teaspoon salt; 1 teaspoon fish sauce; For the soup and assembly:; canola oil, for frying; two 15-ounce cans coconut milk; 2 cups chicken broth; 8 pieces chicken thighs or legs; 1 teaspoon cayenne, or to taste; 1 teaspoon ground turmeric (optional); 1 teaspoon fish sauce, or to taste; 1 package Chinese egg noodles; Chile flakes, to taste; 6 lime wedges; 3 to 5 hard-boiled eggs, as garnish; Chopped cilantro, as garnish; Thinly sliced raw shallots, as garnish