feat: 보스 레이드 방 관리 모듈 추가

MMO 서버/데디케이트 서버 연동을 위한 내부 API 엔드포인트 구현:
- POST /api/internal/bossraid/entry — 파티 입장 요청 (방 생성)
- POST /api/internal/bossraid/start — 세션 시작 보고
- POST /api/internal/bossraid/complete — 클리어 보고 + TOL Chain 보상 지급
- POST /api/internal/bossraid/fail — 실패 보고
- GET /api/internal/bossraid/room — 방 조회

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

routes/routes.go

@@ -3,6 +3,7 @@ package routes
 import (
 	"a301_server/internal/announcement"
 	"a301_server/internal/auth"
+	"a301_server/internal/bossraid"
 	"a301_server/internal/chain"
 	"a301_server/internal/download"
 	"a301_server/pkg/middleware"
@@ -15,6 +16,7 @@ func Register(
 	annH *announcement.Handler,
 	dlH *download.Handler,
 	chainH *chain.Handler,
+	brH *bossraid.Handler,
 	authLimiter fiber.Handler,
 	apiLimiter fiber.Handler,
 ) {
@@ -76,6 +78,14 @@ func Register(
 	chainAdmin.Post("/reward", middleware.Idempotency, chainH.GrantReward)
 	chainAdmin.Post("/template", middleware.Idempotency, chainH.RegisterTemplate)
 
+	// Internal - Boss Raid (API key auth)
+	br := api.Group("/internal/bossraid", middleware.ServerAuth)
+	br.Post("/entry", brH.RequestEntry)
+	br.Post("/start", brH.StartRaid)
+	br.Post("/complete", middleware.Idempotency, brH.CompleteRaid)
+	br.Post("/fail", brH.FailRaid)
+	br.Get("/room", brH.GetRoom)
+
 	// Internal - Game server endpoints (API key auth, username-based, idempotency-protected)
 	internal := api.Group("/internal/chain", middleware.ServerAuth)
 	internal.Post("/reward", middleware.Idempotency, chainH.InternalGrantReward)