feat: init pc-monitor project

- Client: Go-based Windows hardware monitoring (CPU, GPU, memory, disk, network, power)
- Server: Go + Gin + SQLite backend with REST API
- Frontend: Vue 3 + Element Plus dashboard
- Docker deployment support
- Windows service installation script

client/collector/power.go

@@ -0,0 +1,47 @@
+package collector
+
+import (
+	"github.com/shirou/gopsutil/v3/host"
+)
+
+type PowerInfo struct {
+	Status      string `json:"status"`
+	BatteryLevel int   `json:"battery_level"`
+	PowerSource  string `json:"power_source"`
+}
+
+func CollectPower() (*PowerInfo, error) {
+	info := &PowerInfo{
+		Status:      "no_battery",
+		BatteryLevel: 0,
+		PowerSource:  "ac",
+	}
+
+	// Try to get battery info
+	battery, err := host.SensorsBattery()
+	if err != nil {
+		return info, nil
+	}
+
+	if battery == nil {
+		return info, nil
+	}
+
+	info.BatteryLevel = int(battery.Percent)
+
+	if battery.PowerSupply {
+		info.PowerSource = "ac"
+	} else {
+		info.PowerSource = "battery"
+	}
+
+	if battery.Charging {
+		info.Status = "charging"
+	} else if battery.Percent >= 100 {
+		info.Status = "full"
+	} else {
+		info.Status = "discharging"
+	}
+
+	return info, nil
+}