refactor(plugins): restructure admin and message_gateway into standard layered sub-packages

backend/plugins/domain/admin/repository/log.go

@@ -0,0 +1,53 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package repository
+
+import (
+	"Wavelet/pkg/util"
+	"context"
+)
+
+// UserDisplayName is the minimal user projection needed to decorate access log rows.
+type UserDisplayName struct {
+	Username string
+	Nickname string
+}
+
+// SearchUserIDsByUsername is the database fallback used when the user contract is absent.
+func SearchUserIDsByUsername(ctx context.Context, username string) ([]uint64, error) {
+	gormDB := GetDB(ctx)
+	if gormDB == nil {
+		return nil, nil
+	}
+
+	var ids []uint64
+	if err := gormDB.Table("w_users").
+		Where("username LIKE ? ESCAPE '\\'", "%"+util.EscapeLike(username)+"%").
+		Pluck("id", &ids).Error; err != nil {
+		return nil, err
+	}
+	return ids, nil
+}
+
+// LoadUserDisplayNames resolves usernames and nicknames for the given ids.
+func LoadUserDisplayNames(ctx context.Context, userIDs []uint64) (map[uint64]UserDisplayName, error) {
+	result := make(map[uint64]UserDisplayName, len(userIDs))
+	gormDB := GetDB(ctx)
+	if gormDB == nil || len(userIDs) == 0 {
+		return result, nil
+	}
+
+	var users []struct {
+		ID       uint64
+		Username string
+		Nickname string
+	}
+	if err := gormDB.Table("w_users").Where("id IN ?", userIDs).Find(&users).Error; err != nil {
+		return nil, err
+	}
+	for _, u := range users {
+		result[u.ID] = UserDisplayName{Username: u.Username, Nickname: u.Nickname}
+	}
+	return result, nil
+}