fix(panel): extract hardcoded security note into i18n keys

panel/src/i18n/resources/en-US/dashboard.json

@@ -32,6 +32,7 @@
   "spec_failed_ratio": "Failed Rate",
   "no_servers_monitor": "No active instances in the cluster",
   "images_count": "Whitelisted backend images available",
+  "images_security_note": ". All backend images undergo Trivy CVE vulnerability scanning before deployment and run in isolated security containers.",
   "legend_title": "3D Node Monitor Legend",
   "legend_running": "Running",
   "legend_starting": "Starting",

panel/src/i18n/resources/zh-CN/dashboard.json

@@ -32,6 +32,7 @@
   "spec_failed_ratio": "节点故障率",
   "no_servers_monitor": "当前集群暂无服务器实例",
   "images_count": "个支持的白名单镜像环境",
+  "images_security_note": "。所有后端镜像运行前均通过 Trivy CVE 漏洞扫描，强制在隔离的安全容器中托管。",
   "legend_title": "3D 节点监控图例",
   "legend_running": "运行中",
   "legend_starting": "启动中",

panel/src/pages/Dashboard.tsx

@@ -314,7 +314,7 @@ function FleetView({
                     <ShieldCheck className="h-4.5 w-4.5 text-primary shrink-0" />
                     <div>
                       <span className="font-semibold text-foreground mr-1">{images.length}</span>
-                      {t("images_count")}。所有后端镜像运行前均通过 Trivy CVE 漏洞扫描，强制在隔离的安全容器中托管。
+                      {t("images_count")}{t("images_security_note")}
                     </div>
                   </div>
                 </CardContent>