[feat] Research project evaluation API (doctoral)

[erikbayerlein]

Epic: #71 (Arguição e Entrevista)
Use Case: #66

Fase 2 — Implementação posterior à fase de inscrição.

Description

Additional evaluation for doctoral candidates' research projects.

Acceptance Criteria

• Similar structure to interview evaluation.
• One or more evaluators can score a doctoral candidate's research project.
• Scoring uses same concept scale (FRACO/REGULAR/BOM/OTIMO).
• Score contributes to doctoral classification formula.
• API clearly separates interview evaluations from project evaluations.