Add admin configs endpoint and related UI components

- Introduced a new endpoint to list all admin configs, enhancing the admin interface for better management.
- Updated API documentation to include the new `/configs` endpoint with pagination and search capabilities.
- Added routing and UI elements for the configs section in the admin panel, improving navigation and accessibility.
- Enhanced localization for the configs feature in both Russian and English, ensuring a user-friendly experience.

frontend/src/shared/api/types.ts

@@ -59,6 +59,23 @@ export type VpnConfigDto = {
   createdAt: string
 }
 
+/** Строка админского списка «Все конфиги» — в отличие от VpnConfigDto содержит владельца и ноду. */
+export type AdminVpnConfigDto = {
+  id: string
+  userId: string
+  userName: string
+  label: string | null
+  clientEmail: string
+  protocol: VpnProtocol
+  location: string
+  nodeName: string
+  usedUpBytes: number
+  usedDownBytes: number
+  expiresAt: string | null
+  status: ConfigStatus
+  createdAt: string
+}
+
 export type AvailableInboundDto = {
   inboundId: string
   displayName: string