Include TotalSummary in kanban board task responses

Add summary field to KanbanBoardResponse so clients can update
dashboard stats without making a separate /summary API call.
This reduces network calls when refreshing task data.

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

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

internal/dto/responses/task.go

@@ -127,6 +127,7 @@ type KanbanBoardResponse struct {
 	Columns       []KanbanColumnResponse `json:"columns"`
 	DaysThreshold int                    `json:"days_threshold"`
 	ResidenceID   string                 `json:"residence_id"`
+	Summary       *TotalSummary          `json:"summary,omitempty"`
 }
 
 // Note: TaskCompletionListResponse pagination removed - returns arrays directly