feat: implement real-time event handling and SSE support; add event publishing and subscription mechanisms

app/game-api/src/realtime/publisher.ts

@@ -0,0 +1,12 @@
+import type { RedisConnector } from '@sammo-ts/infra';
+import { buildGameEventChannel, type RealtimeEvent } from '@sammo-ts/common';
+
+// 게임 서버의 실시간 이벤트를 Redis pub/sub 채널로 송신한다.
+export const publishRealtimeEvent = async (
+    redis: RedisConnector['client'],
+    profileName: string,
+    event: RealtimeEvent
+): Promise<void> => {
+    const channel = buildGameEventChannel(profileName);
+    await redis.publish(channel, JSON.stringify(event));
+};