In a mini processor or mortar, make a paste of the garlic, saffron, parsley, and a pinch of salt. Set aside.
Put chicken in a ziplock bag with 1 tsp salt. Put pork cubes, fish, and scallops in another bag with 1 tsp salt. Place both bags in refrigerator. Put shrimp in a colander and sprinkle with salt.
Preheat oven to 450°F (230°C). Combine clam and chicken broths into a pot to keep warm.
Add 6 tbsp olive oil to a large paella pan or an extra large casserole. Briefly sauté the shrimp, about 1 minute per side. Remove to a bowl. Add chicken to the same pan and brown for 10 minutes total. Remove to the bowl with shrimp. Add pork, fish, and scallops and cook, stirring, 2 minutes more. Transfer to same bowl.
Add 2 tbsp oil and saute sausage for 5 minutes. Then onions and peppers to the sausage and cook until softened. Stir in tomato for 2 more minutes. Add the paprika and rice, coating it with the pan mixture. Pour in broth and bring to a boil. Stir in the garlic-saffron paste and a little salt. Boil for another 3 minutes. Add all the meats and fish and continue to cook until rice is no longer soupy but visible liquid still remains, about 2 minutes.
Scatter peas, pine nuts, and mussels over the top and place pan in oven for 15 minutes uncovered. Remove to the stovetop, cover with a dish towel or foil, and let it sit untouched for 10 minutes. Discard any unopened mussels. Garnish with lemon wedges and serve with spicy garlic sauce on the side,