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>

plugins/network/manifest.json

@@ -0,0 +1,22 @@
+{
+    "name": "network",
+    "version": "1.0.0",
+    "description": "Network device management plugin for switches, APs, cameras, and IDFs",
+    "author": "ShopDB Team",
+    "dependencies": [],
+    "core_version": ">=1.0.0",
+    "api_prefix": "/api/network",
+    "provides": {
+        "asset_type": "network_device",
+        "features": [
+            "network_device_tracking",
+            "port_management",
+            "firmware_tracking",
+            "poe_monitoring"
+        ]
+    },
+    "settings": {
+        "enable_snmp_polling": false,
+        "snmp_community": "public"
+    }
+}