Backend Architecture Refactor — Tasks

Статус: draft

Task 0: Baseline verification before runtime changes.
Task 1: Mask unhandled 500 errors without changing HttpException responses.
Task 2: Harden production runtime config for JWT secrets and credentialed CORS.
Task 3: Harden portfolio position DTO validation for quantity and buyDate.
Task 4: Localize T-Bank gRPC any casts behind typed facade methods.
Task 5: Preserve cache cachedAt metadata on cache hits.
Task 6: Synchronize published backend docs with current MOEX/envelope/health/T-Bank contracts.
Task 7: Run final lint/test/build/docs quality gate and inspect final diff.

Verification Log