chore: убрать неинформативные security stat-карточки

Что сделано:
- удалены три нижние панели 401/403/429, которые визуально не давали пользы
- оставлен рабочий security-граф с легендой Last для наблюдения кодов
- повышена версия дашборда для корректного обновления provisioning

Author: RomanVetrov

monitoring/grafana/provisioning/dashboards/json/task-manager-observability.json

@@ -834,210 +834,6 @@
       ],
       "title": "Security сигналы: 401/403/429 (за 5 минут)",
       "type": "timeseries"
-    },
-    {
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "background"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              },
-              {
-                "color": "orange",
-                "value": 5
-              },
-              {
-                "color": "red",
-                "value": 20
-              }
-            ]
-          },
-          "unit": "short",
-          "decimals": 0,
-          "noValue": "0"
-        },
-        "overrides": []
-      },
-      "gridPos": {
-        "h": 6,
-        "w": 8,
-        "x": 0,
-        "y": 37
-      },
-      "id": 11,
-      "options": {
-        "colorMode": "value",
-        "graphMode": "none",
-        "justifyMode": "center",
-        "orientation": "auto",
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        },
-        "textMode": "value"
-      },
-      "targets": [
-        {
-          "editorMode": "code",
-          "expr": "round(sum(increase(http_requests_total{status=\"401\"}[5m])) or vector(0))",
-          "legendFormat": "",
-          "range": false,
-          "refId": "A",
-          "instant": true
-        }
-      ],
-      "title": "401 за 5 минут",
-      "type": "stat"
-    },
-    {
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "background"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              },
-              {
-                "color": "orange",
-                "value": 3
-              },
-              {
-                "color": "red",
-                "value": 10
-              }
-            ]
-          },
-          "unit": "short",
-          "decimals": 0,
-          "noValue": "0"
-        },
-        "overrides": []
-      },
-      "gridPos": {
-        "h": 6,
-        "w": 8,
-        "x": 8,
-        "y": 37
-      },
-      "id": 12,
-      "options": {
-        "colorMode": "value",
-        "graphMode": "none",
-        "justifyMode": "center",
-        "orientation": "auto",
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        },
-        "textMode": "value"
-      },
-      "targets": [
-        {
-          "editorMode": "code",
-          "expr": "round(sum(increase(http_requests_total{status=\"403\"}[5m])) or vector(0))",
-          "legendFormat": "",
-          "range": false,
-          "refId": "A",
-          "instant": true
-        }
-      ],
-      "title": "403 за 5 минут",
-      "type": "stat"
-    },
-    {
-      "datasource": {
-        "type": "prometheus",
-        "uid": "prometheus"
-      },
-      "fieldConfig": {
-        "defaults": {
-          "color": {
-            "mode": "background"
-          },
-          "mappings": [],
-          "thresholds": {
-            "mode": "absolute",
-            "steps": [
-              {
-                "color": "green",
-                "value": null
-              },
-              {
-                "color": "orange",
-                "value": 2
-              },
-              {
-                "color": "red",
-                "value": 5
-              }
-            ]
-          },
-          "unit": "short",
-          "decimals": 0,
-          "noValue": "0"
-        },
-        "overrides": []
-      },
-      "gridPos": {
-        "h": 6,
-        "w": 8,
-        "x": 16,
-        "y": 37
-      },
-      "id": 13,
-      "options": {
-        "colorMode": "value",
-        "graphMode": "none",
-        "justifyMode": "center",
-        "orientation": "auto",
-        "reduceOptions": {
-          "calcs": [
-            "lastNotNull"
-          ],
-          "fields": "",
-          "values": false
-        },
-        "textMode": "value"
-      },
-      "targets": [
-        {
-          "editorMode": "code",
-          "expr": "round(sum(increase(http_requests_total{status=\"429\"}[5m])) or vector(0))",
-          "legendFormat": "",
-          "range": false,
-          "refId": "A",
-          "instant": true
-        }
-      ],
-      "title": "429 за 5 минут",
-      "type": "stat"
     }
   ],
   "refresh": "5s",
@@ -1115,6 +911,6 @@
   "timezone": "",
   "title": "Task Manager API - Observability",
   "uid": "task-manager-observability",
-  "version": 4,
+  "version": 5,
   "weekStart": ""
 }