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/process_linux.go

@@ -0,0 +1,33 @@
+//go:build !windows
+// +build !windows
+
+package monitoring
+
+import (
+	"os"
+	"strconv"
+)
+
+// ProcessCount returns the number of running processes
+func ProcessCount() (count int) {
+	return processCountLinux()
+}
+
+// processCountLinux counts processes by reading /proc directory
+func processCountLinux() (count int) {
+	procDir := "/proc"
+
+	entries, err := os.ReadDir(procDir)
+	if err != nil {
+		return 0
+	}
+
+	for _, entry := range entries {
+		if _, err := strconv.ParseInt(entry.Name(), 10, 64); err == nil {
+			//if _, err := filepath.ParseInt(entry.Name(), 10, 64); err == nil {
+			count++
+		}
+	}
+
+	return count
+}