Added uptime functionality

internal/uptime/win_uptime.go

@@ -0,0 +1,23 @@
+//go:build windows
+
+package uptime
+
+import (
+	"rpi5-health/internal/windows_system"
+
+	"golang.org/x/sys/windows"
+)
+
+type ULONGLONG uint64
+
+func getWinUptime(uptime *windows.LazyProc) (UptimeInformation, error) {
+	uptimeMetric, _, _ := uptime.Call()
+
+	uptimeSeconds := float64(uptimeMetric) / 1000.0
+
+	return UptimeInformation{uptime: uptimeSeconds}, nil
+}
+
+func GetUptimeInformation() (UptimeInformation, error) {
+	return getWinUptime(windows_system.GetWindowsTools().Uptime)
+}