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/network.go

@@ -0,0 +1,68 @@
+package collector
+
+import (
+	"github.com/shirou/gopsutil/v3/net"
+)
+
+type NetInterface struct {
+	Name       string `json:"name"`
+	MACAddress string `json:"mac_address"`
+	IPAddress  string `json:"ip_address"`
+	BytesSent  uint64 `json:"bytes_sent"`
+	BytesRecv  uint64 `json:"bytes_recv"`
+	Speed      uint64 `json:"speed"`
+	IsUp       bool   `json:"is_up"`
+}
+
+func CollectNetwork() ([]NetInterface, error) {
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+
+	counters, err := net.IOCounters(true)
+	if err != nil {
+		return nil, err
+	}
+
+	counterMap := make(map[string]net.IOCountersStat)
+	for _, c := range counters {
+		counterMap[c.Name] = c
+	}
+
+	var nets []NetInterface
+	for _, iface := range interfaces {
+		if iface.Name == "lo" || iface.Name == "Loopback Pseudo-Interface 1" {
+			continue
+		}
+
+		ni := NetInterface{
+			Name:       iface.Name,
+			MACAddress: iface.HardwareAddr,
+			IsUp:       false,
+		}
+
+		for _, addr := range iface.Addrs {
+			if addr.Addr != "" && addr.Addr != "0.0.0.0" {
+				ni.IPAddress = addr.Addr
+				break
+			}
+		}
+
+		for _, flag := range iface.Flags {
+			if flag == "up" {
+				ni.IsUp = true
+				break
+			}
+		}
+
+		if c, ok := counterMap[iface.Name]; ok {
+			ni.BytesSent = c.BytesSent
+			ni.BytesRecv = c.BytesRecv
+		}
+
+		nets = append(nets, ni)
+	}
+
+	return nets, nil
+}