Grate the lime zest and set aside, then juice half of the lime into a large bowl and cut the other half into small wedges. Whisk 1 teaspoon peanut oil and a pinch of salt into the lime juice. Add the slaw and cucumbers and toss to coat.
Heat the remaining 2 teaspoons peanut oil in a large skillet over medium-high heat. Add the shallot and cook until softened, 2 to 3 minutes. Add the ginger and cook, stirring, until soft but not browned, about 1 minute. Stir in the pork and ½ teaspoon salt and cook, breaking up the meat with a wooden spoon, until browned in spots and no longer pink, 6 to 8 minutes. Carefully pour off all but about 1 tablespoon fat from the skillet. Stir in the chili-garlic sauce, fish sauce and lime zest and remove from the heat.
Divide the slaw mixture among bowls. Top with the pork, herbs and peanuts; serve with the lime wedges.