fix(thresholds): add observed threshold for attribute 188 with value 0 (upstream PR AnalogJ#551)

Adds an observed threshold entry for ATA attribute 188 (Command_Timeout)
when the value is exactly 0. This fixes incorrect failure rate calculations
for drives with zero command timeouts, particularly affecting Seagate drives.

Related to issues with Seagate Command Timeout display (AnalogJ#799).

Origin: AnalogJ#551
Original author: @aivus

Author: Starosdev

webapp/backend/pkg/thresholds/ata_attribute_metadata.go

@@ -692,6 +692,12 @@ var AtaMetadata = map[int]AtaAttributeMetadata{
 			return rawValue
 		},
 		ObservedThresholds: []ObservedThreshold{
+			{
+				Low:               0,
+				High:              0,
+				AnnualFailureRate: 0.024893587674442153,
+				ErrorInterval:     []float64{0.020857343769186413, 0.0294830350167543},
+			},
 			{
 				Low: 0,
 				// This is set arbitrarily to avoid notifications caused by low