[feat] CV validation dashboard for secretary

[erikbayerlein]

Epic: #70 (Validação de CV)
Use Case: #65

Fase 2 — Implementação posterior à fase de inscrição.

Description

Dashboard for the secretary to monitor and manage CV validation progress.

Acceptance Criteria

• Overview of all candidates with validation status (pending/validated).
• Filter by theme, professor, level, validation status.
• Secretary can validate any candidate's CV.
• Progress indicators showing percentage of candidates validated.