Dissolve System Settings into individual settings pages

The monolithic tab page competed with the settings rail as a second
navigation system, and its Integrations tab was a dumping ground. Each
section is now its own routed rail page (ServiceNow, Zabbix Supplies,
Dell Warranty, Collector PC Types, Branding, Floor Map, Printing and
Labels, Email/SMTP, Audit, Authentication, Asset Identifiers, Global
Search), thin over a shared useSystemSettings composable, grouped
logically in the rail with system groups clustered last. Old
/settings/system?tab= URLs redirect to the right page.

Also fixes the post-login redirect: the auth guard now remembers the
intended destination and Login returns there (same-site paths only).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/views/settings/settingsNav.js

@@ -1,15 +1,18 @@
 // Shared settings navigation catalog.
 // Used by SettingsLayout (left rail) and SettingsIndex (landing overview) so the
 // grouping lives in one place.
-import { Factory, MapPin, Tag, Package, Droplets, Monitor, MonitorSmartphone, Laptop, Cog, Building, Globe, Link, Settings, FileText, Users, Puzzle, Bell, Network, Home, Wrench, Printer, Router, Palette, SlidersHorizontal, Contact } from 'lucide-vue-next'
+// Order: site identity + the reference-data catalogs users touch daily come
+// first, then the platform/system groups (integrations, communication, search,
+// plugins, access) cluster together at the end.
+import { Factory, MapPin, Tag, Package, Droplets, Monitor, MonitorSmartphone, Laptop, Cog, Building, Globe, Link, History, FileText, Users, Puzzle, Bell, Network, Home, Wrench, Printer, Router, Palette, SlidersHorizontal, Contact, Mail, ShieldCheck, KeyRound, Fingerprint, Search } from 'lucide-vue-next'
 
 export const settingsGroups = [
   {
     title: 'Site & Facility',
     cards: [
       { to: '/settings/site', icon: Home, title: 'Site & Facility', description: 'Site URL/FQDN, facility name, PC access domain, employee-ID pattern, printer hostname template' },
-      { to: '/settings/system?tab=map', icon: MapPin, title: 'Floor Map', description: 'Facility floor-plan blueprint and dimensions' },
-      { to: '/settings/system?tab=branding', icon: Palette, title: 'Branding', description: 'Site, QR, and badge logos, favicon, and primary brand color' },
+      { to: '/settings/floormap', icon: MapPin, title: 'Floor Map', description: 'Facility floor-plan blueprint image and pixel dimensions (width, height) for the site map' },
+      { to: '/settings/branding', icon: Palette, title: 'Branding', description: 'Site, QR, and badge logos, favicon, and brand primary, accent, sidebar, and theme colors' },
     ],
   },
   {
@@ -74,17 +77,41 @@ export const settingsGroups = [
       { to: '/settings/notificationtypes', icon: Bell, title: 'Notification Types', description: 'Manage notification types, display styles, colors, and auto-expiry' },
     ],
   },
+  {
+    title: 'Integrations',
+    cards: [
+      { to: '/settings/servicenow', icon: Link, title: 'ServiceNow', description: 'ServiceNow ticket links (incident, change) prefixes and global-search redirect' },
+      { to: '/settings/zabbix', icon: Droplets, title: 'Zabbix Supplies', description: 'Zabbix API for real-time printer toner and supply monitoring' },
+      { to: '/settings/dellwarranty', icon: ShieldCheck, title: 'Dell Warranty', description: 'Dell TechDirect warranty API lookup by service tag' },
+      { to: '/settings/pctypemapping', icon: Laptop, title: 'Collector PC Types', description: 'Map collector enrollment imaging pc-type (shopfloor) to a Computer Type' },
+    ],
+  },
+  {
+    title: 'Communication',
+    cards: [
+      { to: '/settings/email', icon: Mail, title: 'Email / SMTP', description: 'SMTP mail host for email notifications, alerts, TLS, from address, and recipients' },
+    ],
+  },
+  {
+    title: 'Search & Identity',
+    cards: [
+      { to: '/settings/globalsearch', icon: Search, title: 'Global Search', description: 'Choose which content types (domains) appear in global search results' },
+      { to: '/settings/assetidentifiers', icon: Fingerprint, title: 'Asset Identifiers', description: 'Enable optional asset identifiers per type: gauge lab, maintenance, FQDN hostname' },
+      { to: '/settings/printing', icon: Printer, title: 'Printing & Labels', description: 'Printed QR code and USB label targets, barcode style, and URL templates' },
+    ],
+  },
   {
     title: 'System',
     cards: [
-      { to: '/settings/system', icon: Settings, title: 'System Settings', description: 'Integrations (ServiceNow, Zabbix), branding, identifiers, search, and PC-type mapping' },
       { to: '/settings/plugins', icon: Puzzle, title: 'Plugins', description: 'Enable or disable installed plugins' },
     ],
   },
   {
-    title: 'Access & Audit',
+    title: 'Access & Security',
     cards: [
+      { to: '/settings/authentication', icon: KeyRound, title: 'Authentication', description: 'SAML single sign-on (SSO) with your IdP, local login, and auto-create users' },
       { to: '/settings/users', icon: Users, title: 'Users & Roles', description: 'Manage user accounts and permissions' },
+      { to: '/settings/audit', icon: History, title: 'Audit & Logging', description: 'Audit log retention period and history purge policy' },
       { to: '/settings/auditlogs', icon: FileText, title: 'Audit Logs', description: 'View system activity and change history' },
     ],
   },