Smoked Whitefish Dip with Bagel Chips

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3 unsliced everything bagels

1 1 1/2 to 2 pounds smoked whitefish, meat reserved, skin and bones discarded (about 3 cups) 

1/4 cup whipped cream cheese 

1/4 cup mayonnaise 

1 tablespoon chopped fresh dill fronds 

1 teaspoon lemon zest and 1 tablespoon lemon juice (from 1 lemon)

Pinch of cayenne pepper, optional 

Freshly ground black pepper 

2 celery stalks, finely chopped plus more sliced for serving

1 shallot, finely chopped 

Nonstick cooking spray 

For Serving: endive and sliced cucumbers