init: hgmj server initial commit

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

models/v/immod/app.go

@@ -0,0 +1,13 @@
+package immod
+
+import "time"
+
+// AppRes app端消息响应
+type MsgAppRes struct {
+	MsgID     uint64    `json:"msgID" bson:"msgID"`     //通知ID
+	Title     string    `json:"title" bson:"title"`     //标题
+	Content   string    `json:"content" bson:"content"` //内容
+	Operate   Action    `json:"operate" bson:"operate"` //操作类型
+	UpdatedAt time.Time `json:"updatedAt" bson:"updatedAt"`
+	CreatedAt time.Time `json:"createdAt" bson:"createdAt"`
+}