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/os_linux.go

@@ -0,0 +1,32 @@
+//go:build !windows
+// +build !windows
+
+package monitoring
+
+import (
+	"bufio"
+	"os"
+	"strings"
+)
+
+func OSName() string {
+	file, err := os.Open("/etc/os-release")
+	if err != nil {
+		return "Linux"
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		if strings.HasPrefix(line, "PRETTY_NAME=") {
+			return strings.Trim(line[len("PRETTY_NAME="):], `"`)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return "Linux"
+	}
+
+	return "Linux"
+}