Add Anti-Sybil Review Constraints

[Naomi-Gift]

Any address can review any project once. There are no constraints to reduce low-quality or spam reviews.

Acceptance criteria:

• Define optional review eligibility rules.
• Add configurable minimum account age, fee, endorsement, or verification requirement if feasible.
• Keep default behavior documented.
• Tests cover eligible and ineligible review attempts.

[BigManly4]

Hello maintainer, I would love to resolve this issue within few hours. I am a Full-Stack Dev with contributions to Oss projects. Please assign