Add honeycomb completion heatmap and data migration framework

- Add completion_summary endpoint data to residence detail response
- Track completed_from_column on task completions (overdue/due_soon/upcoming)
- Add GetCompletionSummary repo method with monthly aggregation
- Add one-time data migration framework (data_migrations table + registry)
- Add backfill migration to classify historical completions
- Add standalone backfill script for manual/dry-run usage

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/handlers/residence_handler.go

@@ -92,7 +92,8 @@ func (h *ResidenceHandler) GetResidence(c echo.Context) error {
 		return apperrors.BadRequest("error.invalid_residence_id")
 	}
 
-	response, err := h.residenceService.GetResidence(uint(residenceID), user.ID)
+	userNow := middleware.GetUserNow(c)
+	response, err := h.residenceService.GetResidence(uint(residenceID), user.ID, userNow)
 	if err != nil {
 		return err
 	}