Add USB, Notifications, Network plugins and reusable EmployeeSearch component

New Plugins:
- USB plugin: Device checkout/checkin with employee lookup, checkout history
- Notifications plugin: Announcements with types, scheduling, shopfloor display
- Network plugin: Network device management with subnets and VLANs
- Equipment and Computers plugins: Asset type separation

Frontend:
- EmployeeSearch component: Reusable employee lookup with autocomplete
- USB views: List, detail, checkout/checkin modals
- Notifications views: List, form with recognition mode
- Network views: Device list, detail, form
- Calendar view with FullCalendar integration
- Shopfloor and TV dashboard views
- Reports index page
- Map editor for asset positioning
- Light/dark mode fixes for map tooltips

Backend:
- Employee search API with external lookup service
- Collector API for PowerShell data collection
- Reports API endpoints
- Slides API for TV dashboard
- Fixed AppVersion model (removed BaseModel inheritance)
- Added checkout_name column to usbcheckouts table

Styling:
- Unified detail page styles
- Improved pagination (page numbers instead of prev/next)
- Dark/light mode theme improvements

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/views/pcs/PCForm.vue

@@ -242,6 +242,7 @@
             <ShopFloorMap
               :pickerMode="true"
               :initialPosition="form.mapleft !== null ? { left: form.mapleft, top: form.maptop } : null"
+              :theme="currentTheme"
               @positionPicked="handlePositionPicked"
             />
           </div>
@@ -270,6 +271,7 @@ import { useRoute, useRouter } from 'vue-router'
 import { machinesApi, machinetypesApi, statusesApi, vendorsApi, locationsApi, modelsApi, operatingsystemsApi } from '../../api'
 import ShopFloorMap from '../../components/ShopFloorMap.vue'
 import Modal from '../../components/Modal.vue'
+import { currentTheme } from '../../stores/theme'
 
 const route = useRoute()
 const router = useRouter()