feat(#4): 后台抽奖记录列表 GET /admin/lottery/draws

- 分页列出 lottery_draw，join 奖品快照 + 用户邮箱 + 发放账本(grant_ledger)
- 支持 activity/user/win/dispatch_state/prize_type/时间窗过滤
- 展示中奖人/奖品/发放状态/发放结果(如"已新建订阅并加 30 天")

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/handler/admin/lottery/admin_claims_handler.go

@@ -72,3 +72,14 @@ func LotteryClaimsSummaryHandler(svcCtx *svc.ServiceContext) func(c *gin.Context
 		result.HttpResult(c, resp, err)
 	}
 }
+
+// ListLotteryDrawsHandler GET /v1/admin/lottery/draws
+func ListLotteryDrawsHandler(svcCtx *svc.ServiceContext) func(c *gin.Context) {
+	return func(c *gin.Context) {
+		var req types.ListAdminLotteryDrawsRequest
+		_ = c.ShouldBind(&req)
+		l := adminlottery.NewListLotteryDrawsLogic(c.Request.Context(), svcCtx)
+		resp, err := l.ListLotteryDraws(&req)
+		result.HttpResult(c, resp, err)
+	}
+}