refactor: 重构项目结构

- 将server端相关依赖单独防止在server中

interval/server/api/dto/message.go

@@ -0,0 +1,17 @@
+package dto
+
+import (
+	"git.jinshen.cn/remilia/push-server/interval/server/model"
+)
+
+type Message struct {
+	Topic   string `json:"topic"`
+	Content string `json:"content"`
+}
+
+func MessageFromModel(m model.Message) Message {
+	return Message{
+		Topic:   string(m.Topic),
+		Content: string(m.Content),
+	}
+}