[Fresh 2026-04][Backend] Performance: remove N+1 queries in org dashboard aggregation

[Baskarayelu]

Description

Batch/preload to remove N+1 query behavior while preserving correctness.

Requirements and context

• Backend-only; correctness preserved.

Suggested execution

• Branch: fix/org-dashboard-nplus1-fresh
• Implement: src/repositories/, src/services/
• Tests: tests/

Example commit message

fix(dashboard): remove N+1 queries in org aggregation

Guidelines

• Timeframe: 96 hours

[heymide]

@heymide has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Based on your request, I will implement and fix this issue according to the design requirement and to fit your acceptance criteria

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Congratulations, @heymide! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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