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/net.go

@@ -0,0 +1,83 @@
+package monitoring
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/shirou/gopsutil/net"
+)
+
+func ConnectionsCount() (tcpCount, udpCount int, err error) {
+	tcps, err := net.Connections("tcp")
+	if err != nil {
+		return 0, 0, fmt.Errorf("failed to get TCP connections: %w", err)
+	}
+	udps, err := net.Connections("udp")
+	if err != nil {
+		return 0, 0, fmt.Errorf("failed to get UDP connections: %w", err)
+	}
+
+	return len(tcps), len(udps), nil
+}
+
+var (
+	// 预定义常见的回环和虚拟接口名称
+	loopbackNames = map[string]struct{}{
+		"lo": {}, "lo0": {}, "localhost": {},
+		"brd0": {}, "docker0": {}, "docker1": {},
+		"veth0": {}, "veth1": {}, "veth2": {}, "veth3": {},
+		"veth4": {}, "veth5": {}, "veth6": {}, "veth7": {},
+	}
+)
+
+func NetworkSpeed() (totalUp, totalDown, upSpeed, downSpeed uint64, err error) {
+	// 获取第一次网络IO计数器
+	ioCounters1, err := net.IOCounters(false)
+	if err != nil {
+		return 0, 0, 0, 0, fmt.Errorf("failed to get network IO counters: %w", err)
+	}
+
+	if len(ioCounters1) == 0 {
+		return 0, 0, 0, 0, fmt.Errorf("no network interfaces found")
+	}
+
+	// 统计第一次所有非回环接口的流量
+	var totalUp1, totalDown1 uint64
+	for _, interfaceStats := range ioCounters1 {
+		// 使用映射表进行O(1)查找
+		if _, isLoopback := loopbackNames[interfaceStats.Name]; isLoopback {
+			continue // 跳过回环接口
+		}
+		totalUp1 += interfaceStats.BytesSent
+		totalDown1 += interfaceStats.BytesRecv
+	}
+
+	// 等待1秒
+	time.Sleep(time.Second)
+
+	// 获取第二次网络IO计数器
+	ioCounters2, err := net.IOCounters(false)
+	if err != nil {
+		return 0, 0, 0, 0, fmt.Errorf("failed to get network IO counters: %w", err)
+	}
+
+	if len(ioCounters2) == 0 {
+		return 0, 0, 0, 0, fmt.Errorf("no network interfaces found")
+	}
+
+	// 统计第二次所有非回环接口的流量
+	var totalUp2, totalDown2 uint64
+	for _, interfaceStats := range ioCounters2 {
+		if _, isLoopback := loopbackNames[interfaceStats.Name]; isLoopback {
+			continue // 跳过回环接口
+		}
+		totalUp2 += interfaceStats.BytesSent
+		totalDown2 += interfaceStats.BytesRecv
+	}
+
+	// 计算速度 (每秒的速率)
+	upSpeed = totalUp2 - totalUp1
+	downSpeed = totalDown2 - totalDown1
+
+	return totalUp2, totalDown2, upSpeed, downSpeed, nil
+}