fix: harden auth and investment synchronization

Resolve A01-A10 and C01-C07 from the backend audit.
Preserve auth failures, forced candle reconciliation and forecast freshness.
Validate MOEX responses and nested HTTP errors; remove unused legacy paths.

Verified: 209 unit tests, 262 SQLite e2e tests on Linux, OpenAPI and durability.
Record the remaining macOS native SQLite abort in the audit.

src/common/logging/request-logging.middleware.ts

@@ -42,9 +42,6 @@ export class RequestLoggingMiddleware implements NestMiddleware {
         ...(response.locals.publicErrorCode
           ? { code: response.locals.publicErrorCode as string }
           : {}),
-        ...(response.locals.errorStack
-          ? { stack: response.locals.errorStack as string }
-          : {}),
       };
       const level =
         response.statusCode >= httpStatus.HTTP_STATUS_INTERNAL_SERVER_ERROR