Fix summarizer worker infinite loop and map AI trigger errors to safe HTTP responses.

Paginate un-summarized tenders and mark rows missing notice/folder IDs as handled so the worker cannot spin forever. Return 400/404 for validation and not-found cases on AI summarize/analyze triggers instead of leaking internal errors as 500.

internal/tender/service.go

@@ -15,6 +15,7 @@ import (
 	"tm/internal/customer"
 	"tm/pkg/ai_summarizer"
 	"tm/pkg/logger"
+	orm "tm/pkg/mongo"
 	"tm/pkg/response"
 )
 
@@ -1187,11 +1188,11 @@ func (s *tenderService) GetAISummary(ctx context.Context, id string) (*AISummary
 // It calls the external AI service HTTP API to generate summaries.
 func (s *tenderService) TriggerAISummarize(ctx context.Context, id string) (*AISummarizeResponse, error) {
 	if id == "" {
-		return nil, fmt.Errorf("tender ID cannot be empty")
+		return nil, ErrEmptyTenderID
 	}
 
 	if s.aiSummarizerClient == nil {
-		return nil, fmt.Errorf("AI summarizer service is not configured")
+		return nil, ErrAINotConfigured
 	}
 
 	// Get tender to build the request
@@ -1201,18 +1202,24 @@ func (s *tenderService) TriggerAISummarize(ctx context.Context, id string) (*AIS
 			"tender_id": id,
 			"error":     err.Error(),
 		})
+		if errors.Is(err, orm.ErrDocumentNotFound) {
+			return nil, ErrTenderNotFound
+		}
+		if strings.Contains(err.Error(), "invalid id format") {
+			return nil, ErrInvalidTenderID
+		}
 		return nil, fmt.Errorf("failed to get tender: %w", err)
 	}
 
 	if t == nil {
-		return nil, fmt.Errorf("tender not found")
+		return nil, ErrTenderNotFound
 	}
 
 	if t.NoticePublicationID == "" {
-		return nil, fmt.Errorf("tender has no notice publication ID")
+		return nil, ErrTenderMissingNoticeID
 	}
 	if strings.TrimSpace(t.ContractFolderID) == "" {
-		return nil, fmt.Errorf("tender has no contract folder ID")
+		return nil, ErrTenderMissingContractFolderID
 	}
 
 	reqBody := ai_summarizer.NewSummarizeRequest(t.ContractFolderID, t.NoticePublicationID)
@@ -1274,10 +1281,10 @@ func (s *tenderService) TriggerAISummarize(ctx context.Context, id string) (*AIS
 // TriggerAIAnalyze triggers on-demand agentic analysis for a tender.
 func (s *tenderService) TriggerAIAnalyze(ctx context.Context, id string) (*AIAnalyzeResponse, error) {
 	if id == "" {
-		return nil, fmt.Errorf("tender ID cannot be empty")
+		return nil, ErrEmptyTenderID
 	}
 	if s.aiSummarizerClient == nil {
-		return nil, fmt.Errorf("AI summarizer service is not configured")
+		return nil, ErrAINotConfigured
 	}
 
 	t, err := s.repository.GetByID(ctx, id)
@@ -1286,16 +1293,22 @@ func (s *tenderService) TriggerAIAnalyze(ctx context.Context, id string) (*AIAna
 			"tender_id": id,
 			"error":     err.Error(),
 		})
+		if errors.Is(err, orm.ErrDocumentNotFound) {
+			return nil, ErrTenderNotFound
+		}
+		if strings.Contains(err.Error(), "invalid id format") {
+			return nil, ErrInvalidTenderID
+		}
 		return nil, fmt.Errorf("failed to get tender: %w", err)
 	}
 	if t == nil {
-		return nil, fmt.Errorf("tender not found")
+		return nil, ErrTenderNotFound
 	}
 	if t.NoticePublicationID == "" {
-		return nil, fmt.Errorf("tender has no notice publication ID")
+		return nil, ErrTenderMissingNoticeID
 	}
 	if strings.TrimSpace(t.ContractFolderID) == "" {
-		return nil, fmt.Errorf("tender has no contract folder ID")
+		return nil, ErrTenderMissingContractFolderID
 	}
 
 	reqBody := ai_summarizer.NewAnalyzeRequest(t.ContractFolderID, t.NoticePublicationID)