Introduce endpoints to manage the prospects table: a new DELETE /prospects/empty to remove all records (handles missing table) and a revamped GET /prospects/seed that recreates and seeds a prospects table from embedded CSV data.

Introduce endpoints to manage the prospects table: a new DELETE /prospects/empty to remove all records (handles missing table) and a revamped GET /prospects/seed that recreates and seeds a prospects table from embedded CSV data. #89