feat: Add GatherManager + AutoDoors plugin config modules

- GatherManager: 2-tab editor (Resource Rates with 1x-10x presets,
  Advanced with Pickup/Quarry/Excavator/Survey modifiers), 9 resource
  types with slider+number inputs, CRUD + deploy + import via NATS
- AutoDoors: Global settings (delay sliders, 6 toggles), 7 door type
  toggles, permission group overrides table, CRUD + deploy + import
- DB: migrations 015 (gather_configs) + 018 (autodoors_configs)
- Backend: GatherModule + AutoDoorsModule registered in app.module.ts
- Frontend: Pinia stores, Vue views, router routes, sidebar nav items
- Icons: Pickaxe (gather), DoorOpen (autodoors)
- All type checks pass: tsc + vue-tsc zero errors

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

frontend/src/components/layout/DashboardLayout.vue

@@ -29,6 +29,8 @@ import {
   FolderOpen,
   Crosshair,
   Navigation2,
+  Pickaxe,
+  DoorOpen,
   Menu,
   X,
 } from 'lucide-vue-next'
@@ -48,6 +50,8 @@ const navItems = [
   { name: 'File Manager', path: '/files', icon: FolderOpen, permission: 'files.view' },
   { name: 'Loot Builder', path: '/loot-builder', icon: Crosshair, permission: 'loot.view' },
   { name: 'Teleport Config', 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: 'Auto-Wiper', path: '/wipes', icon: RefreshCw, permission: 'wipes.view' },
   { name: 'Maps', path: '/maps', icon: Map, permission: 'maps.view' },
   { name: 'Chat Log', path: '/chat', icon: MessageSquare, permission: 'chat.view' },