Add lightweight summary endpoint for task statistics

- Add GET /api/residences/summary/ endpoint
- Returns task statistics without full residence data
- Enables efficient refresh of home screen summary counts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/services/residence_service.go

@@ -120,6 +120,40 @@ func (s *ResidenceService) GetMyResidences(userID uint) (*responses.MyResidences
 	}, nil
 }
 
+// GetSummary returns just the task summary statistics for a user's residences
+// This is a lightweight endpoint for refreshing summary counts without full residence data
+func (s *ResidenceService) GetSummary(userID uint) (*responses.TotalSummary, error) {
+	residences, err := s.residenceRepo.FindByUser(userID)
+	if err != nil {
+		return nil, err
+	}
+
+	summary := &responses.TotalSummary{
+		TotalResidences: len(residences),
+	}
+
+	// Get task statistics if task repository is available
+	if s.taskRepo != nil && len(residences) > 0 {
+		// Collect residence IDs
+		residenceIDs := make([]uint, len(residences))
+		for i, r := range residences {
+			residenceIDs[i] = r.ID
+		}
+
+		// Get aggregated statistics
+		stats, err := s.taskRepo.GetTaskStatistics(residenceIDs)
+		if err == nil && stats != nil {
+			summary.TotalTasks = stats.TotalTasks
+			summary.TotalPending = stats.TotalPending
+			summary.TotalOverdue = stats.TotalOverdue
+			summary.TasksDueNextWeek = stats.TasksDueNextWeek
+			summary.TasksDueNextMonth = stats.TasksDueNextMonth
+		}
+	}
+
+	return summary, nil
+}
+
 // CreateResidence creates a new residence
 func (s *ResidenceService) CreateResidence(req *requests.CreateResidenceRequest, ownerID uint) (*responses.ResidenceResponse, error) {
 	// TODO: Check subscription tier limits