1 teaspoon canola oil 1 cup chopped onion 2 1/2 teaspoons red curry paste 1 1/2 teaspoons minced fresh garlic 1 teaspoon minced fresh ginger 1 cup fat-free, lower-sodium chicken broth 2 teaspoons brown sugar 2 (12-ounce) packages frozen pureed butternut squash 1 (14-ounce) can light coconut milk 1 1/2 teaspoons fish sauce 1/4 teaspoon salt 1/2 cup chopped unsalted, dry-roasted peanuts 1/4 cup cilantro leaves 1 lime, cut into 8 wedges