Refactor AI summarization functionality by removing document summarization worker

- Removed the DocumentSummarizationWorker and its related scheduling logic from the worker bootstrap.
- Updated the AI summarizer client initialization comment for clarity.
- Added a new error type for cases when tender documents have not been scraped yet, enhancing error handling in the tender service.
- Modified API documentation to reflect changes in AI summary retrieval logic, ensuring accurate descriptions of on-demand summarization behavior.

This update streamlines the AI summarization process by eliminating the document summarization worker, improving overall system efficiency and clarity in error handling.

cmd/worker/bootstrap/bootstrap.go

@@ -95,20 +95,6 @@ func InitWorker(config Config, mongoManager *mongo.ConnectionManager, appLogger
 	// Create a single shared cron scheduler for all recurring jobs
 	scheduler := schedule.NewCronScheduler(appLogger, mongoManager, noticeRepo)
 
-	// Document summarization via external AI service (requires AI_SUMMARIZER_API_BASE_URL)
-	if aiClient != nil {
-		scheduler.AddJob(schedule.Job{
-			Name: "Document Summarization Worker Job",
-			Func: func() {
-				worker := workers.NewDocumentSummarizationWorker(mongoManager, appLogger, tenderRepo, aiClient, aiStorage)
-				worker.Run()
-			},
-			Expr: "0 11 * * * *", // Run at 11 AM every day (after AI pipeline scrape)
-		})
-	} else {
-		appLogger.Warn("Document summarization worker not scheduled: AI summarizer API is not configured", map[string]interface{}{})
-	}
-
 	// Schedule Notice Worker job (no blocking run at startup; first tick runs on schedule)
 	workerInterval := config.Worker.Interval
 	if workerInterval == "" {