Add services feature with mock data and components

Introduces comprehensive services management module with:
- Dynamic service and category tables
- Localization support for services section
- Mock data for services and categories
- Responsive UI components for services listing
- Menu navigation and styling updates

Enhances application's service management capabilities

PlanTempus.Application/Features/Localization/Translations/da.json

@@ -7,6 +7,7 @@
     "suppliers": "Leverandører",
     "customers": "Kunder",
     "employees": "Medarbejdere",
+    "services": "Services",
     "reports": "Statistik & Rapporter",
     "settings": "Indstillinger",
     "account": "Abonnement & Konto"
@@ -219,6 +220,29 @@
       "overdue": "Forfalden"
     }
   },
+  "services": {
+    "title": "Services",
+    "subtitle": "Administrer services og priser",
+    "tabs": {
+      "services": "Services",
+      "categories": "Kategorier"
+    },
+    "stats": {
+      "totalServices": "Services i alt",
+      "activeCategories": "Aktive kategorier",
+      "averagePrice": "Gns. pris"
+    },
+    "searchPlaceholder": "Søg efter service...",
+    "createService": "Opret service",
+    "createCategory": "Opret kategori",
+    "table": {
+      "service": "Service",
+      "category": "Kategori",
+      "duration": "Varighed",
+      "price": "Pris",
+      "serviceCount": "Antal services"
+    }
+  },
   "employees": {
     "title": "Medarbejdere",
     "subtitle": "Administrer brugere, roller og rettigheder",