Enhance tender recommendation caching and page refresh logic

- Introduced a new `RecommendedTendersPageCacheRefresher` interface to manage the asynchronous refresh of recommendation pages in Redis, improving cache management.
- Updated the `companyService` to support setting page cache languages and refreshing the recommended tenders page cache based on company IDs.
- Enhanced the `tenderService` to build and invalidate recommended tenders page caches, ensuring timely updates and efficient retrieval of cached recommendations.
- Added configuration options for recommendation page cache languages in the `AISummarizerConfig`, allowing for flexible language support.
- Implemented unit tests for the new caching logic and page refresh functionality, ensuring robust validation of the recommendation caching process.

This update significantly improves the efficiency and responsiveness of the tender recommendation service by integrating enhanced caching mechanisms and page refresh capabilities.

internal/tender/service.go

@@ -16,6 +16,7 @@ import (
 	"tm/pkg/ai_summarizer"
 	"tm/pkg/logger"
 	orm "tm/pkg/mongo"
+	"tm/pkg/redis"
 	"tm/pkg/response"
 
 	"golang.org/x/sync/errgroup"
@@ -89,6 +90,9 @@ type tenderService struct {
 	logger               logger.Logger
 	aiSummarizerClient   AISummarizerClient
 	aiSummarizerStorage  AISummarizerStorage
+	redisClient          redis.Client
+	pageCacheTTL         time.Duration
+	pageCacheLanguages   []string
 	defaultLanguage      string
 }
 
@@ -111,6 +115,9 @@ func NewService(
 	logger logger.Logger,
 	aiClient AISummarizerClient,
 	aiStorage AISummarizerStorage,
+	redisClient redis.Client,
+	recommendationPageCacheTTL time.Duration,
+	recommendationPageCacheLanguages []string,
 	defaultLanguage string,
 ) Service {
 	if strings.TrimSpace(defaultLanguage) == "" {
@@ -125,6 +132,9 @@ func NewService(
 		logger:               logger,
 		aiSummarizerClient:   aiClient,
 		aiSummarizerStorage:  aiStorage,
+		redisClient:          redisClient,
+		pageCacheTTL:         recommendationPageCacheTTL,
+		pageCacheLanguages:   normalizePageCacheLanguages(defaultLanguage, recommendationPageCacheLanguages),
 		defaultLanguage:      strings.ToLower(defaultLanguage),
 	}
 }
@@ -967,6 +977,11 @@ func (s *tenderService) Recommend(ctx context.Context, form *SearchForm, paginat
 		"company_ids": companyIDs,
 	})
 
+	lang := s.pickResponseLanguage(form.Language)
+	if result, ok := s.recommendFromPageCache(ctx, companyID, companyIDs, form, pagination, lang); ok {
+		return result, nil
+	}
+
 	var (
 		recommendations []company.RecommendedTenderResponse
 		err             error
@@ -983,6 +998,10 @@ func (s *tenderService) Recommend(ctx context.Context, form *SearchForm, paginat
 		return s.emptySearchResponse(pagination), nil
 	}
 
+	if len(companyIDs) == 0 && companyID != "" {
+		s.ScheduleRefreshRecommendedTendersPageCache(companyID)
+	}
+
 	excluded, excludedByCompany, err := s.loadRecommendationExclusions(ctx, form, companyID, companyIDs)
 	if err != nil {
 		if form.ExcludeRejectedTenders {
@@ -995,7 +1014,6 @@ func (s *tenderService) Recommend(ctx context.Context, form *SearchForm, paginat
 		return nil, err
 	}
 
-	lang := s.pickResponseLanguage(form.Language)
 	now := time.Now().Unix()
 	pageResult, err := s.buildRecommendationPage(
 		ctx,