fix(traffic): прекращать опрос изменённого источника

docs/ux-ui/acceptance/traffic-sourceguard-source-2026-10-13.json

@@ -0,0 +1,10 @@
+{
+  "date": "2026-10-13",
+  "block": "12.5.189",
+  "matched": {
+    "backend": 460,
+    "frontend": 524
+  },
+  "different": [],
+  "missing": []
+}