perf(api): batch leaderboard stat lookups

[ugcodrr]

Summary

• replace per-row player leaderboard stat lookups with a single Mongo query using uuid: { $in: ids }
• replace per-row guild leaderboard stat lookups with a single Mongo query using id: { $in: ids }
• preserve Redis leaderboard ordering by mapping fetched documents back to the original id list
• include the document id fields in the projection so the batched lookup can build stable lookup maps without fetching full documents

Why / Benefits

• Reduces leaderboard additional-stat hydration from up to 10 Mongo round trips per page to one query per leaderboard page.
• Lowers Mongo connection pressure and API overhead while keeping the response shape and ordering unchanged.
• Keeps the existing projection behavior for additional fields, only adding the id field needed for remapping.

Validation

• pnpm --filter api test:types
• pnpm --filter api lint

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Project	Deployment	Actions	Updated (UTC)
statsify	Building	Preview	May 12, 2026 0:11am