Refactor AdminAuthController and AuthService to implement admin-specific token refresh functionality; update TokensService to handle refresh token logic with improved transaction management and error handling.

src/modules/auth/controllers/admin-auth.controller.ts

@@ -53,6 +53,6 @@ export class AdminAuthController {
   @ApiOperation({ summary: 'refresh the user access token / refresh token' })
   @Post('refresh')
   refreshToken(@Body() refreshTokenDto: RefreshTokenDto) {
-    return this.authService.refreshToken(refreshTokenDto.refreshToken);
+    return this.authService.refreshTokenAdmin(refreshTokenDto.refreshToken);
   }
 }