feat: notification service

pkg/schema/fbs/notification.fbs

@@ -0,0 +1,38 @@
+// notification contains shared FlatBuffers payloads published by
+// Notification Service toward the gateway client event stream.
+namespace notification;
+
+table GameTurnReadyEvent {
+  game_id:string;
+  turn_number:int64;
+}
+
+table GameFinishedEvent {
+  game_id:string;
+  final_turn_number:int64;
+}
+
+table LobbyApplicationSubmittedEvent {
+  game_id:string;
+  applicant_user_id:string;
+}
+
+table LobbyMembershipApprovedEvent {
+  game_id:string;
+}
+
+table LobbyMembershipRejectedEvent {
+  game_id:string;
+}
+
+table LobbyInviteCreatedEvent {
+  game_id:string;
+  inviter_user_id:string;
+}
+
+table LobbyInviteRedeemedEvent {
+  game_id:string;
+  invitee_user_id:string;
+}
+
+root_type GameTurnReadyEvent;