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/disk.go

@@ -0,0 +1,38 @@
+package collector
+
+import (
+	"github.com/shirou/gopsutil/v3/disk"
+)
+
+type DiskInfo struct {
+	MountPoint string  `json:"mount_point"`
+	Total      uint64  `json:"total"`
+	Used       uint64  `json:"used"`
+	Usage      float64 `json:"usage"`
+	FileSystem string  `json:"file_system"`
+}
+
+func CollectDisks() ([]DiskInfo, error) {
+	partitions, err := disk.Partitions(false)
+	if err != nil {
+		return nil, err
+	}
+
+	var disks []DiskInfo
+	for _, p := range partitions {
+		usage, err := disk.Usage(p.Mountpoint)
+		if err != nil {
+			continue
+		}
+
+		disks = append(disks, DiskInfo{
+			MountPoint: p.Mountpoint,
+			Total:      usage.Total,
+			Used:       usage.Used,
+			Usage:      usage.UsedPercent,
+			FileSystem: p.Fstype,
+		})
+	}
+
+	return disks, nil
+}