fix(api): отличать отказ терминала от пустого вывода

backend/package.json

@@ -13,6 +13,7 @@
     "db:studio": "drizzle-kit studio",
     "db:migrate-from-sqlite": "tsx src/scripts/migrate-sqlite-to-pg.ts",
     "facts:rebuild": "tsx src/scripts/rebuild-flow-facts.ts",
+    "test:exec": "tsx src/routes/exec.test.ts && tsx src/plugins/auth.exec.test.ts",
     "test:auth": "tsx src/lib/permissions.test.ts && tsx src/plugins/auth.smoke.test.ts && tsx src/plugins/auth.ospf-optimizer.test.ts",
     "test:wireguard": "npx tsx src/services/wireguard-config.test.ts",
     "test:traffic-rate": "tsx src/services/traffic-rate.test.ts",
@@ -24,7 +25,7 @@
     "test:ros-file": "tsx src/services/ros-file-contents.test.ts",
     "test:backups": "tsx src/services/s3-backup-client.test.ts",
     "test:live-maps": "tsx src/services/ospf-route-parse.test.ts && tsx src/services/vxlan-live.test.ts && tsx src/services/containers-live.test.ts && tsx src/services/firewall-poll.test.ts && tsx src/services/gre-catalog-poll.test.ts && tsx src/routes/filters-gre-catalog.test.ts && tsx src/routes/bgp-catalog.test.ts && tsx src/services/bgp-catalog-parse.test.ts && tsx src/routes/ospf-catalog.test.ts && tsx src/services/ospf-observed-values.test.ts",
-    "test": "npm run test:alert-engine && npm run test:auth && npm run test:wireguard && npm run test:traffic-rate && npm run test:traffic-flow && npm run test:users && npm run test:pg && npm run test:backups && npm run test:live-maps && npm run test:ospf-optimizer && npm run test:recursive-routes && npm run test:config-sync && npm run test:ros-file",
+    "test": "npm run test:exec && npm run test:alert-engine && npm run test:auth && npm run test:wireguard && npm run test:traffic-rate && npm run test:traffic-flow && npm run test:users && npm run test:pg && npm run test:backups && npm run test:live-maps && npm run test:ospf-optimizer && npm run test:recursive-routes && npm run test:config-sync && npm run test:ros-file",
     "test:geoip": "tsx src/services/traffic-flow-geoip.test.ts",
     "test:ospf-optimizer": "tsx src/services/ospf-optimizer-identity.test.ts && tsx src/services/ospf-optimizer-metrics.test.ts && tsx src/services/ospf-optimizer-plan.test.ts && tsx src/routes/ospf-optimizer.test.ts"
   },