Refactor AI summarizer client initialization to include MongoDB manager and add statistics endpoint

- Updated `InitAISummarizerClient` to accept `mongoManager` for tracking translation success.
- Introduced new `Statistics` endpoint in the dashboard to fetch scraping and translation statistics.
- Enhanced `TranslationWorker` to utilize the new success counter for tracking successful translations.
- Added necessary data structures and query forms for statistics reporting.

This refactor improves the tracking of AI translation success and provides new insights through the dashboard statistics.

internal/tender/service.go

@@ -1476,7 +1476,7 @@ func (s *tenderService) TriggerAITranslate(ctx context.Context, id, language str
 		return nil, fmt.Errorf("tender has no contract folder ID")
 	}
 
-	title, description, err := s.resolveTranslation(ctx, t, targetLanguage)
+	title, description, fromAPI, err := s.resolveTranslation(ctx, t, targetLanguage, ai_summarizer.TranslationRequestSourceManualTrigger)
 	if err != nil {
 		s.logger.Error("AI translation failed", map[string]interface{}{
 			"tender_id": id,
@@ -1487,6 +1487,14 @@ func (s *tenderService) TriggerAITranslate(ctx context.Context, id, language str
 		return nil, fmt.Errorf("AI translation request failed: %w", err)
 	}
 
+	if fromAPI {
+		s.logger.Info("Manual AI translation request succeeded", map[string]interface{}{
+			"tender_id": id,
+			"notice_id": t.NoticePublicationID,
+			"language":  targetLanguage,
+		})
+	}
+
 	return s.buildAITranslateResponse(t, targetLanguage, title, description), nil
 }
 
@@ -1500,11 +1508,11 @@ func (s *tenderService) buildAITranslateResponse(t *Tender, language, title, des
 	}
 }
 
-func (s *tenderService) resolveTranslation(ctx context.Context, t *Tender, language string) (string, string, error) {
+func (s *tenderService) resolveTranslation(ctx context.Context, t *Tender, language, requestSource string) (string, string, bool, error) {
 	if s.aiSummarizerStorage != nil {
 		stored, err := s.aiSummarizerStorage.GetTranslationFromStorage(ctx, t.ContractFolderID, t.NoticePublicationID, language)
 		if err == nil {
-			return stored.Title, stored.Description, nil
+			return stored.Title, stored.Description, false, nil
 		}
 		if !errors.Is(err, ai_summarizer.ErrTranslationNotReady) &&
 			!errors.Is(err, ai_summarizer.ErrObjectNotFound) &&
@@ -1523,11 +1531,12 @@ func (s *tenderService) resolveTranslation(ctx context.Context, t *Tender, langu
 		Title:               t.Title,
 		Description:         t.Description,
 		Language:            language,
+		RequestSource:       requestSource,
 	})
 	if err != nil {
-		return "", "", err
+		return "", "", false, err
 	}
-	return resp.TranslatedTitle, resp.TranslatedDescription, nil
+	return resp.TranslatedTitle, resp.TranslatedDescription, true, nil
 }
 
 func (s *tenderService) pickResponseLanguage(language *string) string {