Shred zucchini using a grater or food processor. Transfer to a large colander and sprinkle generously with salt. Toss and set aside.
Mix eggs, leek, garlic, basil, chives, and cheese in a large bowl. Add flour and bread crumbs and mix to combine. Set batter aside.
Rinse the zucchini and then use your hands or a towel to squeeze excess liquid from the squash. Add zucchini to the batter and mix well.
Heat griddle or a frying pan to medium-high heat. Brush cooking surface with oil before adding dollops of batter using a 1/4 cup measure filled about 3/4 full. The batter will be very thick and may need coaxing from the measuring cup. Gently flatten the pancakes and fry until golden brown on the bottom, about 4 minutes. Turn and brown the second side. Repeat with remaining batter, keeping finished pancakes warm in an oven heated to 200° F.
If desired, serve with dipping sauces. For the Sweet & Spicy Chile Sauce, bring water and sugar to boil over medium heat, stirring frequently until sugar dissolves. Remove from heat and add remaining ingredients. Cool sauce, and chill, covered, for at least an hour.
For the Sour Cream Chile Sauce, combine all ingredients in a small bowl. Chill, covered, until ready to serve.