Refactor monitoring package: remove platform-specific files and consolidate OS detection and process counting logic

- Deleted os_windows.go and process_windows.go, replacing them with platform-agnostic implementations in unit directory.
- Removed Linux-specific process counting logic from process_linux.go and integrated it into unit.
- Consolidated uptime and OS name retrieval into unit files for better organization.
- Updated update mechanism to use global variables for current version and repository.
- Introduced command-line flags for configuration, including disabling auto-update and web SSH.
- Implemented WebSocket connection handling and terminal interaction for both Unix and Windows systems.
- Added basic info upload functionality to server package, enhancing monitoring capabilities.

monitoring/unit/cpu.go

@@ -0,0 +1,62 @@
+package monitoring
+
+import (
+	"runtime"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/shirou/gopsutil/cpu"
+)
+
+type CpuInfo struct {
+	CPUName         string  `json:"cpu_name"`
+	CPUArchitecture string  `json:"cpu_architecture"`
+	CPUCores        int     `json:"cpu_cores"`
+	CPUUsage        float64 `json:"cpu_usage"`
+}
+
+func Cpu() CpuInfo {
+	cpuinfo := CpuInfo{}
+	info, err := cpu.Info()
+	if err != nil {
+		cpuinfo.CPUName = "Unknown"
+	}
+	// multiple CPU
+	// 多个 CPU
+	if len(info) > 1 {
+		cpuCountMap := make(map[string]int)
+		for _, cpu := range info {
+			cpuCountMap[cpu.ModelName]++
+		}
+		for modelName, count := range cpuCountMap {
+			if count > 1 {
+				cpuinfo.CPUName += modelName + " x " + strconv.Itoa(count) + ", "
+			} else {
+				cpuinfo.CPUName += modelName + ", "
+			}
+		}
+		cpuinfo.CPUName = cpuinfo.CPUName[:len(cpuinfo.CPUName)-2] // Remove trailing comma and space
+	} else if len(info) == 1 {
+		cpuinfo.CPUName = info[0].ModelName
+	}
+
+	cpuinfo.CPUName = strings.TrimSpace(cpuinfo.CPUName)
+
+	cpuinfo.CPUArchitecture = runtime.GOARCH
+
+	cores, err := cpu.Counts(true)
+	if err != nil {
+		cpuinfo.CPUCores = 1 // Error case
+	}
+	cpuinfo.CPUCores = cores
+
+	// Get CPU Usage
+	percentages, err := cpu.Percent(1*time.Second, false)
+	if err != nil {
+		cpuinfo.CPUUsage = 0.0 // Error case
+	} else {
+		cpuinfo.CPUUsage = percentages[0]
+	}
+	return cpuinfo
+}