chore: implement sync.Pool for badge generator

[kashalls]

This also fixes an issue where an value of 10 would match ranges [10,20] instead of [0,10].

[kashalls]

Code review

Found 1 issue:

1. GetColorConfig silently changes from first-match to last-match semantics. The iteration was changed from a forward range loop to a reverse index loop, meaning when a metric value falls within multiple overlapping color ranges, the last defined range now wins instead of the first. This is an undocumented behavioral change bundled into a sync.Pool performance PR — users with configs relying on range priority ordering will silently get different colors.

kromgo/pkg/kromgo/utils.go

Lines 10 to 16 in e6676ed

	func GetColorConfig(colors []configuration.MetricColor, value float64) configuration.MetricColor {
	for i := len(colors) - 1; i >= 0; i-- {
	colorConfig := colors[i]
	if value >= colorConfig.Min && value <= colorConfig.Max {
	return colorConfig
	}
	}

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