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/en.json

@@ -7,6 +7,7 @@
     "suppliers": "Suppliers",
     "customers": "Customers",
     "employees": "Employees",
+    "services": "Services",
     "reports": "Statistics & Reports",
     "settings": "Settings",
     "account": "Subscription & Account"
@@ -219,6 +220,29 @@
       "overdue": "Overdue"
     }
   },
+  "services": {
+    "title": "Services",
+    "subtitle": "Manage services and pricing",
+    "tabs": {
+      "services": "Services",
+      "categories": "Categories"
+    },
+    "stats": {
+      "totalServices": "Total services",
+      "activeCategories": "Active categories",
+      "averagePrice": "Avg. price"
+    },
+    "searchPlaceholder": "Search for service...",
+    "createService": "Create service",
+    "createCategory": "Create category",
+    "table": {
+      "service": "Service",
+      "category": "Category",
+      "duration": "Duration",
+      "price": "Price",
+      "serviceCount": "Service count"
+    }
+  },
   "employees": {
     "title": "Employees",
     "subtitle": "Manage users, roles and permissions",