Remove summary from list API responses

Summary statistics are now calculated client-side from kanban data.
This removes the summary field from MyResidencesResponse and
KanbanBoardResponse. Mutation endpoints still return summary via
WithSummaryResponse<T> for immediate cache updates.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/dto/responses/task.go

@@ -114,11 +114,11 @@ type KanbanColumnResponse struct {
 }
 
 // KanbanBoardResponse represents the kanban board
+// NOTE: Summary statistics are calculated client-side from kanban data
 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