init: hgmj server initial commit

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

common/db/opt.go

@@ -0,0 +1,27 @@
+package db
+
+// 事务设置
+type TransOpts struct {
+	ReEntryCount *int //重入次数
+	//...
+}
+
+func (t *TransOpts) SetReEntry(count int) *TransOpts {
+	t.ReEntryCount = &count
+	return t
+}
+
+// MergeTransOpts 合并事务设置
+func MergeTransOpts(opts []*TransOpts) *TransOpts {
+	transOpts := &TransOpts{}
+	for _, opt := range opts {
+		if opt == nil {
+			continue
+		}
+		if opt.ReEntryCount != nil {
+			transOpts.ReEntryCount = opt.ReEntryCount
+			//...
+		}
+	}
+	return transOpts
+}