DEV: Pass the user who requested the summary to the strategy. (#24489)

This change allows the `discourse-ai` plugin to log the user who requested the summary in the `AiApiAuditLog`.

plugins/chat/app/controllers/chat/api/summaries_controller.rb

@@ -31,7 +31,7 @@ class Chat::Api::SummariesController < Chat::ApiController
         if content[:contents].empty?
           I18n.t("chat.summaries.no_targets")
         else
-          strategy.summarize(content).dig(:summary)
+          strategy.summarize(content, current_user).dig(:summary)
         end
 
       render json: { summary: summarized_text }