refactor: remove db package and move database logic to service layer

service/node_service.go

@@ -12,6 +12,18 @@ type NodeService interface {
 	CanClose(id string) (bool, []string, error)
 }
 
+func InitNodeService(path string) error {
+	return InitSqliteDB(path)
+}
+
+func GetNodeService(cfg Config) (NodeService, error) {
+	db, err := GetSqliteDB(cfg)
+	if err != nil {
+		return nil, err
+	}
+	return &sqliteNodeService{db: db, userID: cfg.GetUser()}, nil
+}
+
 type listFilter struct {
 	tagPrefixes  []string
 	assignee     string