fix(opportunities): normalize unknown categories and support programs

fix(config): correct frontend URLs setting

feat(opportunities): add protected batch synchronization endpoint

feat(collectors): add Erasmus Mundus collector

feat(collectors): add Campus France collector

feat(collectors): add Campus France collector

feat(collectors): add African Union opportunities collector

feat(collectors): add University of Bamenda collector

fix(collectors): clean and deduplicate Dschang opportunities

feat(collectors): add University of Dschang collector

feat(collectors): add University of Douala opportunity collector

feat(collectors): add University of Buea opportunity collector

fix(collectors): normalize MINESUP text matching

fix(collectors): improve MINESUP opportunity detection

refactor(collectors): optimize MINESUP opportunity extraction

fix(collectors): correction of MINESUP collector validation

feat(collectors): add MINESUP collector validation

feat(opportunities): add official UNESCO internships collector

fix(opportunities): collect Mastercard institutions from official JSON

fix(opportunities): improve Mastercard Foundation collector

feat(collectors): implement Mastercard Foundation collector

fix(api): remove duplicated opportunities route prefix

feat: collect official opportunity metadata

fix: use the configured database session dependency

fix: pass source slug during opportunity synchronization

feat: synchronize Chevening opportunities with Neon

feat: add Chevening opportunity collector

feat: add opportunity collector contracts

feat(opportunities): add verified opportunities API

feat(database): add user model and initial migration

fix(config): restore debug setting

feat(database): connect API to Neon PostgreSQL

feat: initialize VerifPulse FastAPI backend