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/cpu.go

@@ -0,0 +1,41 @@
+package collector
+
+import (
+	"github.com/shirou/gopsutil/v3/cpu"
+	"github.com/shirou/gopsutil/v3/host"
+)
+
+type CPUInfo struct {
+	Usage       float64   `json:"usage"`
+	Temperature float64   `json:"temperature"`
+	CoreUsage   []float64 `json:"core_usage"`
+}
+
+func CollectCPU() (*CPUInfo, error) {
+	info := &CPUInfo{}
+
+	// Get overall CPU usage
+	percent, err := cpu.Percent(0, false)
+	if err == nil && len(percent) > 0 {
+		info.Usage = percent[0]
+	}
+
+	// Get per-core CPU usage
+	perCPU, err := cpu.Percent(0, true)
+	if err == nil {
+		info.CoreUsage = perCPU
+	}
+
+	// Get CPU temperature
+	temps, err := host.SensorsTemperatures()
+	if err == nil {
+		for _, temp := range temps {
+			if temp.Temperature > 0 {
+				info.Temperature = temp.Temperature
+				break
+			}
+		}
+	}
+
+	return info, nil
+}