feat(backend): add security headers, admin guard enforcement, stellarmilestone handler, and API versioning - #584
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… milestone handler, and API versioning - Install and configure helmet middleware with CSP, X-Frame-Options: DENY, HSTS, nosniff, referrer-policy; configure CORS via CORS_ORIGINS env var - Fix AuthGuard to look up user from DB and attach role to request - Add SuperAdminGuard for super-admin-only endpoints - Add promote/demote user endpoints with safety checks and audit logging - Implement handleMilestoneReleased in StellarEventListenerService with DB updates, WebSocket events, notifications, and audit trail - Implement URL-based API versioning with /v1/ prefix for all endpoints - Add ApiVersionMiddleware for backward-compatible unversioned URL rewriting with Sunset, X-API-Version, and Link headers (RFC 8594) - Scaffold v2 endpoint structure with placeholder controllers - Configure Swagger UI with version selector (v1 current, v2 scaffold) - Update frontend API client and services to use /v1/ prefix - Document API versioning strategy in CONTRIBUTING.md - Fix pre-existing test and lint issues across backend - Add E2E and unit tests for all new features (28+ new tests)
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KuchiMercy
approved these changes
Aug 26, 2026
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closes #530
closes #532
closes #533
closes #534