[LuckyBeekeper]

Overview

This PR documents the GET /account/:id/token-concentration endpoint, which measures how concentrated an account's token (non-native) holdings are. It returns a concentration risk label derived from the HHI methodology, the top holding's share of total token value, and supporting fields so portfolio risk tools can flag dangerously concentrated positions.

Related Issue

Changes

📄 Account Endpoint Docs

• [MODIFY] docs/account-endpoints.md
  • Added documentation for GET /account/:id/token-concentration.
  • Documented the response shape: { success: true, data: { accountId, concentrationRisk, topHoldingPercent, topHoldingAsset, tokenCount, hhi } }.
  • Documented the concentrationRisk thresholds: critical above 8000 HHI, high above 5000, moderate above 2500, and low below 2500.
  • Noted that the endpoint returns 404 when the account does not exist.
  • Clarified that the computation focuses specifically on token (non-native) positions.

Verification Results

Docs-only change — no code or tests modified.

Acceptance Criteria	Status
Returns { success: true, data: { accountId, concentrationRisk, topHoldingPercent, topHoldingAsset, tokenCount, hhi } }	✅ Documented response shape
concentrationRisk is "critical" above 8000 HHI, "high" above 5000, "moderate" above 2500, and "low" below 2500	✅ Thresholds documented
Returns 404 if account does not exist	✅ Documented error case

Closes #1152