security: require authentication on logout endpoint

[AtlasLabs797]

Motivation

• Harden session management by removing anonymous access to the POST /api/auth/logout endpoint to reduce unnecessary attack surface and audit noise, and associate the change to version V-01.07.

Description

• Replaced [AllowAnonymous] with [Authorize] on Logout in Atlas Balance/backend/src/AtlasBalance.API/Controllers/AuthController.cs and recorded the finding and mitigation in Documentacion/LOG_ERRORES_INCIDENCIAS.md and Documentacion/DOCUMENTACION_CAMBIOS.md.

Testing

• Attempted to run the targeted automated test dotnet test ... --filter FullyQualifiedName~AuthControllerTests, but the command failed in this environment because dotnet is not installed (dotnet: No such file or directory), so no tests were executed here; please run the backend test suite and full CI (including Docker/Testcontainers E2E) in CI/DEV to validate the change.

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Codex Task