Include TotalSummary in CRUD responses to eliminate redundant API calls

Backend changes:
- Add WithSummaryResponse wrappers for Task, TaskCompletion, and Residence CRUD
- Update services to return summary with all mutations (create, update, delete)
- Update handlers to pass through new response types
- Add getSummaryForUser helper for fetching summary in CRUD operations
- Wire ResidenceService into TaskService for summary access
- Add summary field to JoinResidenceResponse

This optimization eliminates the need for a separate getSummary() call after
every task/residence mutation, reducing network calls from 2 to 1.

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

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

internal/handlers/residence_handler.go

@@ -161,7 +161,7 @@ func (h *ResidenceHandler) DeleteResidence(c *gin.Context) {
 		return
 	}
 
-	err = h.residenceService.DeleteResidence(uint(residenceID), user.ID)
+	response, err := h.residenceService.DeleteResidence(uint(residenceID), user.ID)
 	if err != nil {
 		switch {
 		case errors.Is(err, services.ErrResidenceNotFound):
@@ -174,7 +174,7 @@ func (h *ResidenceHandler) DeleteResidence(c *gin.Context) {
 		return
 	}
 
-	c.JSON(http.StatusOK, gin.H{"message": i18n.LocalizedMessage(c, "message.residence_deleted")})
+	c.JSON(http.StatusOK, response)
 }
 
 // GenerateShareCode handles POST /api/residences/:id/generate-share-code/