feat: add automatic cluster sync and IPAM discovery with configurable intervals, firewall log file parsing, and enhanced flow prioritization

Add RuntimeSettingsRead/RuntimeSettingsUpdate schemas with auto_node_sync_enabled/auto_node_sync_interval_minutes/auto_ipam_sync_enabled/auto_ipam_sync_interval_minutes/last_node_auto_sync_at/last_ipam_auto_sync_at fields, implement firewall_log_lines_from_files to parse /var/log/pve-firewall.log with max_lines limit and error collection, extend collect_firewall_log

frontend/src/pages/Nodes.tsx

@@ -1,8 +1,8 @@
 import { useMutation, useQuery } from "@tanstack/react-query";
-import { Activity, Cpu, Copy, RadioTower, ScrollText } from "lucide-react";
+import { Activity, Cpu, Copy, RadioTower, RefreshCcw, ScrollText } from "lucide-react";
 import { useState } from "react";
 
-import { AgentInstallInfo, api, Node } from "../api/client";
+import { AgentInstallInfo, api, Node, RuntimeSettings } from "../api/client";
 import { DataTable } from "../components/DataTable";
 import { iconButtonClass, secondaryButtonClass } from "../components/FormControls";
 import { LoadingOverlay } from "../components/LoadingOverlay";
@@ -11,6 +11,7 @@ import { PageHeader } from "../components/PageHeader";
 
 export function Nodes() {
   const nodes = useQuery({ queryKey: ["nodes-agents"], queryFn: () => api<Node[]>("/nodes/agents") });
+  const settings = useQuery({ queryKey: ["settings"], queryFn: () => api<RuntimeSettings>("/settings") });
   const [selectedNode, setSelectedNode] = useState<Node | null>(null);
   const [detailNode, setDetailNode] = useState<Node | null>(null);
   const [copied, setCopied] = useState(false);
@@ -21,6 +22,13 @@ export function Nodes() {
       setCopied(false);
     },
   });
+  const toggleAutoSync = useMutation({
+    mutationFn: () => api<RuntimeSettings>("/settings", {
+      method: "PATCH",
+      body: JSON.stringify({ auto_node_sync_enabled: !settings.data?.auto_node_sync_enabled }),
+    }),
+    onSuccess: () => settings.refetch(),
+  });
 
   async function copyCommand() {
     if (!installInfo.data) {
@@ -53,6 +61,18 @@ export function Nodes() {
     <>
       <PageHeader title="Nodes" subtitle="Cluster nodes, capacity, health, and NexaFabric agent enrollment." />
       <LoadingOverlay open={installInfo.isPending} message="Generating node agent installer..." />
+      <div className="mb-4 flex flex-wrap items-center justify-between gap-3 rounded-md border border-border bg-panel p-3">
+        <div>
+          <div className="text-sm font-medium">Automatic node sync</div>
+          <div className="text-xs text-slate-500">
+            {settings.data?.auto_node_sync_enabled ? `Enabled every ${settings.data.auto_node_sync_interval_minutes} minutes` : "Disabled"}
+          </div>
+        </div>
+        <button className={secondaryButtonClass} disabled={toggleAutoSync.isPending || !settings.data} onClick={() => toggleAutoSync.mutate()}>
+          <RefreshCcw size={16} />
+          {settings.data?.auto_node_sync_enabled ? "Disable Auto Sync" : "Enable Auto Sync"}
+        </button>
+      </div>
       {nodes.isLoading ? <div className="rounded-md border border-border bg-panel p-8 text-sm">Loading...</div> : null}
       {nodes.error ? <div className="rounded-md border border-danger p-4 text-sm text-danger">Failed to load nodes.</div> : null}
       {!nodes.isLoading && !nodes.error ? (