Implement pricing management functionality and update related components

- Added new endpoints for managing global pricing settings, including retrieval and updates for `PricePerConfigPerQuarter` and `PricePerConfigPerYear`.
- Updated `RoleService` and related commands to remove pricing fields from role management, ensuring a clear separation between role configurations and global pricing.
- Enhanced the `FactoryResetCommandHandler` to include seeding of pricing settings during a factory reset.
- Modified frontend components to support new pricing settings, including forms for creating and updating pricing information.
- Updated API documentation to reflect changes in pricing management endpoints and their expected request/response formats.
- Adjusted tests to ensure proper coverage for new pricing functionalities and their integration with existing role management features.

frontend/src/routes/admin/pricing.tsx

@@ -0,0 +1,36 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { useQuery } from '@tanstack/react-query'
+import { useTranslation } from 'react-i18next'
+import { Button } from '@/shared/ui/button'
+import { Card, CardContent, CardHeader, CardTitle } from '@/shared/ui/card'
+import { getPricingSettings } from '@/features/admin/pricing/api'
+import { PricingSettingsEditor } from '@/features/admin/pricing/PricingSettingsEditor'
+
+export const Route = createFileRoute('/admin/pricing')({ component: AdminPricingPage })
+
+function AdminPricingPage() {
+  const { t } = useTranslation()
+  const { data, isLoading, isError, refetch } = useQuery({ queryKey: ['admin-pricing'], queryFn: getPricingSettings })
+
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle className="text-base">{t('admin.pricing.title')}</CardTitle>
+      </CardHeader>
+      <CardContent>
+        {isLoading && <p className="text-sm text-muted-foreground">…</p>}
+
+        {isError && (
+          <div className="flex items-center gap-2">
+            <p className="text-sm text-muted-foreground">{t('auth.genericError')}</p>
+            <Button variant="outline" size="sm" onClick={() => void refetch()}>
+              {t('activation.retry')}
+            </Button>
+          </div>
+        )}
+
+        {data && <PricingSettingsEditor settings={data} />}
+      </CardContent>
+    </Card>
+  )
+}

frontend/src/routes/admin/roles.tsx

@@ -7,6 +7,7 @@ import { Button } from '@/shared/ui/button'
 import { Badge } from '@/shared/ui/badge'
 import { listRoles, deleteRole } from '@/features/admin/roles/api'
 import { RoleFormDialog } from '@/features/admin/roles/RoleFormDialog'
+import { getPricingSettings } from '@/features/admin/pricing/api'
 import type { RoleDto } from '@/shared/api/types'
 
 export const Route = createFileRoute('/admin/roles')({ component: AdminRolesPage })
@@ -17,8 +18,9 @@ function AdminRolesPage() {
   const [editing, setEditing] = useState<RoleDto | null>(null)
 
   const { data, isLoading, isError, refetch } = useQuery({ queryKey: ['admin-roles'], queryFn: listRoles })
+  const { data: pricing } = useQuery({ queryKey: ['admin-pricing'], queryFn: getPricingSettings })
 
-  const totalPrice = (price: number | null, maxConfigs: number) =>
+  const totalPrice = (price: number | null | undefined, maxConfigs: number) =>
     price == null || maxConfigs < 0 ? t('admin.roles.noPrice') : `${price * maxConfigs} ₽`
 
   const deleteMutation = useMutation({
@@ -69,8 +71,8 @@ function AdminRolesPage() {
                 </td>
                 <td className="py-2">{role.maxConfigs < 0 ? t('unlimited') : role.maxConfigs}</td>
                 <td className="py-2">{role.maxIpLimit < 0 ? t('unlimited') : role.maxIpLimit}</td>
-                <td className="py-2">{totalPrice(role.pricePerConfigPerQuarter, role.maxConfigs)}</td>
-                <td className="py-2">{totalPrice(role.pricePerConfigPerYear, role.maxConfigs)}</td>
+                <td className="py-2">{totalPrice(pricing?.pricePerConfigPerQuarter, role.maxConfigs)}</td>
+                <td className="py-2">{totalPrice(pricing?.pricePerConfigPerYear, role.maxConfigs)}</td>
                 <td className="py-2 text-right">
                   <Button size="sm" variant="outline" onClick={() => setEditing(role)}>
                     {t('admin.roles.edit')}