feat: Add Plugin Configs landing page — collapse 9 sidebar items to 1

Replace individual plugin config sidebar entries with a single "Plugin Configs"
link that opens a card-based landing page. Cards show status (Active/Configured/
Not Configured), config count, and link to existing editor views. Search bar for
filtering. All existing plugin routes preserved for direct navigation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/layout/DashboardLayout.vue

@@ -27,13 +27,6 @@ import {
   AlertTriangle,
   FileText,
   FolderOpen,
-  Crosshair,
-  Navigation2,
-  Pickaxe,
-  DoorOpen,
-  Gift,
-  Flame,
-  Swords,
   Menu,
   X,
 } from 'lucide-vue-next'
@@ -67,15 +60,7 @@ const navSections: NavSection[] = [
   {
     label: 'Plugin Configs',
     items: [
-      { name: 'Loot Builder', path: '/loot-builder', icon: Crosshair, permission: 'loot.view' },
-      { name: 'Teleport', path: '/teleport-config', icon: Navigation2, permission: 'teleport.view' },
-      { name: 'Gather Rates', path: '/gather-manager', icon: Pickaxe, permission: 'gather.view' },
-      { name: 'Auto Doors', path: '/autodoors', icon: DoorOpen, permission: 'autodoors.view' },
-      { name: 'Kits', path: '/kits', icon: Gift, permission: 'kits.view' },
-      { name: 'Furnace Splitter', path: '/furnace-splitter', icon: Flame, permission: 'furnacesplitter.view' },
-      { name: 'Better Chat', path: '/better-chat', icon: MessageSquare, permission: 'betterchat.view' },
-      { name: 'Timed Execute', path: '/timed-execute', icon: Clock, permission: 'timedexecute.view' },
-      { name: 'Raidable Bases', path: '/raidable-bases', icon: Swords, permission: 'raidablebases.view' },
+      { name: 'Plugin Configs', path: '/plugin-configs', icon: Puzzle, permission: null },
     ],
   },
   {