Replace scalar region/city/neighborhood with hasMany arrays so nuclei can span multiple Bahia municipalities while keeping neighborhoods scoped to a single city.
Staff can open recipients for gerais, coordinators, and engaged leaderships without granting access, and coordenadores/lideranças can read geral phones for contact.
Adds electoral nuclei, leaderships, updates, and WhatsApp invite flows behind campaign auth, plus the consolidated schema migration that Vercel applies on deploy.
