support multi-module (#4)

* add multimodule
* re-package modules

server/internal/model/game/route.go

@@ -0,0 +1,34 @@
+package game
+
+import "strings"
+
+type RouteType string
+
+const (
+	RouteMaterial RouteType = "MAT" // Сырьё
+	RouteCapital  RouteType = "CAP" // Промышленность
+	RouteColonist RouteType = "COL" // Колонисты
+	RouteEmpty    RouteType = "EMP" // Пустые корабли
+)
+
+var (
+	RouteTypeSet map[string]RouteType = map[string]RouteType{
+		strings.ToLower(RouteMaterial.String()): RouteMaterial,
+		strings.ToLower(RouteCapital.String()):  RouteCapital,
+		strings.ToLower(RouteColonist.String()): RouteColonist,
+		strings.ToLower(RouteEmpty.String()):    RouteEmpty,
+	}
+	RouteToCargo map[RouteType]CargoType = map[RouteType]CargoType{
+		RouteColonist: CargoColonist,
+		RouteCapital:  CargoCapital,
+		RouteMaterial: CargoMaterial,
+	}
+)
+
+func (rt RouteType) Ref() *RouteType {
+	return &rt
+}
+
+func (rt RouteType) String() string {
+	return string(rt)
+}