feat: auto generated files and new structure (#4)

## Description

<!-- **Please link some issue here describing what you are trying to achieve.**

In case there is no issue present for your PR, please consider creating one.
At least please give us some description what you are trying to achieve and why your change is needed. -->

relates to #1234

## Checklist

- [ ] Issue was linked above
- [ ] Code format was applied: `make fmt`
- [ ] Examples were added / adjusted (see `examples/` directory)
- [x] Docs are up-to-date: `make generate-docs` (will be checked by CI)
- [ ] Unit tests got implemented or updated
- [ ] Acceptance tests got implemented or updated (see e.g. [here](f5f99d1709/stackit/internal/services/dns/dns_acc_test.go))
- [x] Unit tests are passing: `make test` (will be checked by CI)
- [x] No linter issues: `make lint` (will be checked by CI)

Reviewed-on: #4
Reviewed-by: Andre_Harms <andre.harms@stackit.cloud>
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-committed-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

tools/copy.go

@@ -0,0 +1,120 @@
+package tools
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"syscall"
+)
+
+// Source - https://stackoverflow.com/a
+// Posted by Oleg Neumyvakin, modified by community. See post 'Timeline' for change history
+// Retrieved 2026-01-20, License - CC BY-SA 4.0
+
+func CopyDirectory(scrDir, dest string) error {
+	entries, err := os.ReadDir(scrDir)
+	if err != nil {
+		return err
+	}
+	for _, entry := range entries {
+		sourcePath := filepath.Join(scrDir, entry.Name())
+		destPath := filepath.Join(dest, entry.Name())
+
+		fileInfo, err := os.Stat(sourcePath)
+		if err != nil {
+			return err
+		}
+
+		stat, ok := fileInfo.Sys().(*syscall.Stat_t)
+		if !ok {
+			return fmt.Errorf("failed to get raw syscall.Stat_t data for '%s'", sourcePath)
+		}
+
+		switch fileInfo.Mode() & os.ModeType {
+		case os.ModeDir:
+			if err := CreateIfNotExists(destPath, 0o755); err != nil {
+				return err
+			}
+			if err := CopyDirectory(sourcePath, destPath); err != nil {
+				return err
+			}
+		case os.ModeSymlink:
+			if err := CopySymLink(sourcePath, destPath); err != nil {
+				return err
+			}
+		default:
+			if err := Copy(sourcePath, destPath); err != nil {
+				return err
+			}
+		}
+
+		if err := os.Lchown(destPath, int(stat.Uid), int(stat.Gid)); err != nil {
+			return err
+		}
+
+		fInfo, err := entry.Info()
+		if err != nil {
+			return err
+		}
+
+		isSymlink := fInfo.Mode()&os.ModeSymlink != 0
+		if !isSymlink {
+			if err := os.Chmod(destPath, fInfo.Mode()); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func Copy(srcFile, dstFile string) error {
+	out, err := os.Create(dstFile)
+	if err != nil {
+		return err
+	}
+
+	defer out.Close()
+
+	in, err := os.Open(srcFile)
+	if err != nil {
+		return err
+	}
+
+	defer in.Close()
+
+	_, err = io.Copy(out, in)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func Exists(filePath string) bool {
+	if _, err := os.Stat(filePath); os.IsNotExist(err) {
+		return false
+	}
+
+	return true
+}
+
+func CreateIfNotExists(dir string, perm os.FileMode) error {
+	if Exists(dir) {
+		return nil
+	}
+
+	if err := os.MkdirAll(dir, perm); err != nil {
+		return fmt.Errorf("failed to create directory: '%s', error: '%s'", dir, err.Error())
+	}
+
+	return nil
+}
+
+func CopySymLink(source, dest string) error {
+	link, err := os.Readlink(source)
+	if err != nil {
+		return err
+	}
+	return os.Symlink(link, dest)
+}