feat: add Windows platform support

internal/config/permissions_unix.go

@@ -0,0 +1,11 @@
+//go:build !windows
+
+package config
+
+import "os"
+
+// SetSecureFilePermissions configures secure permissions on Unix systems
+func SetSecureFilePermissions(filepath string) error {
+	// Set file permissions to 0600 (owner read/write only)
+	return os.Chmod(filepath, 0600)
+}