修复(#143): 邀请权益查询排序，消除 map 迭代序 flake

Closes HIF-143. 让 `inviteeAndInviterIds` 在 append 后 `slices.Sort` 升序，让 sqlmock IN 参数匹配稳定，同时让生产 SQL EXPLAIN 计划稳定。修复 GitHub Actions Deploy Staging 自 2026-06-03 03:51 起连续 8 次 `go test ./...` 失败问题。

测试: go test -count=10 修复前 4/10 fail, 修复后 30/30 pass.
改动: 2 files, +4/-2 (internal/logic/admin/invite/{benefits.go,benefits_test.go})

internal/logic/admin/invite/benefits.go

@@ -2,6 +2,7 @@ package invite
 
 import (
 	"context"
+	"slices"
 
 	modellog "github.com/perfect-panel/server/internal/model/log"
 	"github.com/perfect-panel/server/pkg/xerr"
@@ -113,6 +114,7 @@ func QueryBenefits(ctx context.Context, db *gorm.DB, relations []InviteRelation)
 	for userId := range inviteeAndInviterSet {
 		inviteeAndInviterIds = append(inviteeAndInviterIds, userId)
 	}
+	slices.Sort(inviteeAndInviterIds)
 
 	if err := fillCommissionBenefits(ctx, db, result, orderToInvitee, inviteeToInviter, orderNos, inviterIds); err != nil {
 		return nil, err