refactor: rename manager codebase dir new-api → heicode, module github.com/heicode/manager

Remove user-facing new-api naming; Docker/network/container names use heicode.
Go imports updated; Dockerfiles and workflows ldflags fixed.

Made-with: Cursor

heicode/common/copy.go

@@ -0,0 +1,19 @@
+package common
+
+import (
+	"fmt"
+
+	"github.com/jinzhu/copier"
+)
+
+func DeepCopy[T any](src *T) (*T, error) {
+	if src == nil {
+		return nil, fmt.Errorf("copy source cannot be nil")
+	}
+	var dst T
+	err := copier.CopyWithOption(&dst, src, copier.Option{DeepCopy: true, IgnoreEmpty: true})
+	if err != nil {
+		return nil, err
+	}
+	return &dst, nil
+}