Make filling: Stir together shrimp, zucchini, curry paste, fish sauce, basil, and scallions. Place 1 rounded Tbsp filling in center of 1 wrapper. Using your fingers, lightly wet edges of wrapper with water. Fold in half and press to seal, pleating as desired. Transfer sealed dumpling to floured or parchment-lined baking sheet. Repeat with remaining filling and wrappers. Add 1 tablespoon salt to large pot of simmering water. In 3 batches, cook dumplings, stirring, until filling is cooked through, 3 to 6 minutes. Using slotted spoon, transfer to paper-towel-lined plate. For pan-fried dumplings: Heat a large skillet on medium-high. Add canola oil and pan-fry boiled dumplings until golden brown and crisp, 1 to 2 minutes per side. Make Thai Lime Dipping Sauce: Stir together water, lime juice, fish sauce, soy sauce and green curry paste. Serve with potstickers.