Heat oven to 425°F; line 18-by-13-inch rimmed sheet with parchment rated for temperature. Toss asparagus and beans with 1 tablespoon oil, 1/4 teaspoon salt, and pepper; spread around edges.
Pat salmon dry; arrange skin-side down in center. Add remaining salt; thinly spread Dijon over each.
Mix panko, zest, and remaining oil; lightly press onto mustard-coated salmon.
Roast 12 to 16 minutes until salmon reaches 145°F, asparagus tender, and crumbs golden. Check thin fillets early.
Drizzle lemon juice over beans and asparagus. Serve 1 fillet with one-quarter vegetables and beans per portion.