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security(backend): enforce token scopes consistently across transfer and admin routes #125

Description

@arisu6804

Problem

Inconsistent scope checks across route and service layers can expose transfer data or permit an unauthorized state change.

Objective

Deliver a production-quality improvement to authentication, scopes, and administrative APIs that creates measurable value for correctness, security, reliability, performance, or maintainability.

Implementation scope

  • Define action/resource scopes; enforce them at service boundaries; cover direct, list, bulk, and admin paths; prevent identifier enumeration.

Acceptance criteria

  • A token can perform only documented actions; unauthorized responses are consistent and non-enumerating; admin paths require explicit scopes.

Required validation

  • Scope matrix, cross-account, bulk-route, malformed-ID, and audit authorization tests.
  • Existing tests and CI remain passing.
  • Add regression coverage for the original failure mode.
  • Do not weaken, delete, or skip unrelated tests to obtain a green build.

PR quality bar

  • Keep the PR focused and explain design tradeoffs, compatibility impact, and test evidence.
  • Avoid typo-only, documentation-only, cosmetic-only, or unrelated refactor submissions.

Out of scope

  • Broad rewrites not required by the acceptance criteria.
  • Changes to unrelated services, contracts, or user flows.

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    GRANTFOX OSSOpen-source issue tracked by GrantFoxMAYBE REWARDEDThis issue may carry a rewardThird CampaignThird Campaign contributionenhancementNew feature or requestpriority:highHigh implementation priority

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