Heat the oil in a large pan over medium-high heat. Cook the ginger, garlic, and onion until the onion softens, about 2 to 3 minutes. Stir in the curry paste, lime juice, brown sugar, and coconut milk; simmer for 5 minutes. Stir in the shrimp, scallops, asparagus, cilantro, and salt; cook until the seafood is opaque, 4 to 5 minutes.