feat: 환경 변수 및 Caddy 라우팅 설정 추가, 게임 API URL 템플릿 지원

app/gateway-frontend/src/env.d.ts

@@ -7,7 +7,11 @@ declare module '*.vue' {
 }
 
 interface ImportMetaEnv {
+    readonly VITE_APP_BASE_PATH?: string;
+    readonly VITE_GATEWAY_API_URL?: string;
+    readonly VITE_GAME_API_URL_TEMPLATE?: string;
     readonly VITE_GAME_WEB_URL?: string;
+    readonly VITE_GAME_WEB_URL_TEMPLATE?: string;
 }
 
 interface ImportMeta {