Enhance VpnConfigDto to include ClientEmail and update related components

- Added ClientEmail property to VpnConfigDto for better client identification.
- Updated ConfigCard to display the ClientEmail in the UI for improved user information.
- Modified API schema and types to accommodate the new ClientEmail field.
- Enhanced localization for displaying the ClientEmail in both Russian and English.

frontend/src/shared/api/schema.gen.ts

@@ -2071,6 +2071,7 @@ export interface components {
             /** Format: uuid */
             id: string;
             label: null | string;
+            clientEmail: string;
             protocol: components["schemas"]["VpnProtocol"];
             location: string;
             /** Format: int64 */

frontend/src/shared/api/types.ts

@@ -49,6 +49,7 @@ export type ActivationStatusDto = {
 export type VpnConfigDto = {
   id: string
   label: string | null
+  clientEmail: string
   protocol: VpnProtocol
   location: string
   usedUpBytes: number