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>

shopdb/core/api/slides.py

@@ -0,0 +1,74 @@
+"""Slides API for TV dashboard slideshow."""
+
+import os
+from flask import Blueprint, current_app
+from shopdb.utils.responses import success_response, error_response, ErrorCodes
+
+slides_bp = Blueprint('slides', __name__)
+
+# Valid image extensions
+VALID_EXTENSIONS = {'.jpg', '.jpeg', '.png', '.gif', '.bmp', '.webp'}
+
+
+@slides_bp.route('', methods=['GET'])
+def get_slides():
+    """
+    Get list of slides for TV dashboard.
+
+    Returns image files from the static/slides directory.
+    """
+    # Look for slides in static folder
+    static_folder = current_app.static_folder
+    if not static_folder:
+        static_folder = os.path.join(current_app.root_path, 'static')
+
+    slides_folder = os.path.join(static_folder, 'slides')
+
+    # Also check frontend public folder
+    frontend_slides = os.path.join(
+        os.path.dirname(os.path.dirname(os.path.dirname(current_app.root_path))),
+        'frontend', 'public', 'slides'
+    )
+
+    # Try multiple possible locations
+    possible_paths = [
+        slides_folder,
+        frontend_slides,
+        '/home/camp/projects/shopdb-flask/shopdb/static/slides',
+        '/home/camp/projects/shopdb-flask/frontend/public/slides',
+    ]
+
+    slides_path = None
+    for path in possible_paths:
+        if os.path.isdir(path):
+            slides_path = path
+            break
+
+    if not slides_path:
+        return success_response({
+            'slides': [],
+            'basepath': '/static/slides/',
+            'message': 'Slides folder not found'
+        })
+
+    # Get list of image files
+    slides = []
+    try:
+        for filename in sorted(os.listdir(slides_path)):
+            ext = os.path.splitext(filename)[1].lower()
+            if ext in VALID_EXTENSIONS:
+                slides.append({'filename': filename})
+    except Exception as e:
+        return error_response(
+            ErrorCodes.SERVER_ERROR,
+            f'Error reading slides: {str(e)}',
+            http_code=500
+        )
+
+    # Determine base path for serving files
+    basepath = '/static/slides/'
+
+    return success_response({
+        'slides': slides,
+        'basepath': basepath
+    })