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

backend/plugins/domain/admin/service/cache.go

@@ -0,0 +1,45 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package service
+
+import (
+	"context"
+	"strconv"
+
+	pkgcache "Wavelet/pkg/cache/disk"
+	"Wavelet/plugins/domain/admin/model"
+	"Wavelet/plugins/domain/admin/repository"
+)
+
+// DiskCacheStatus reports the disk cache usage counters.
+func DiskCacheStatus() pkgcache.Status {
+	return pkgcache.Default().Status()
+}
+
+// ClearDiskCache purges every cached object and resets the tracking counters.
+func ClearDiskCache() error {
+	return pkgcache.Default().Clear()
+}
+
+// UpdateDiskCachePolicy persists the disk cache settings and applies them hot.
+func UpdateDiskCachePolicy(ctx context.Context, req model.UpdateCacheConfigRequest) error {
+	if err := saveOrUpdateCacheConfig(ctx, model.ConfigKeyDiskCacheMaxSizeMB, strconv.FormatInt(req.MaxSizeMB, 10)); err != nil {
+		return err
+	}
+
+	if err := saveOrUpdateCacheConfig(ctx, model.ConfigKeyDiskCacheTTLMinutes, strconv.FormatInt(req.TTLMinutes, 10)); err != nil {
+		return err
+	}
+
+	if err := saveOrUpdateCacheConfig(ctx, model.ConfigKeyDiskCacheLRUEnabled, strconv.FormatBool(req.LRUEnabled)); err != nil {
+		return err
+	}
+
+	pkgcache.Default().UpdatePolicy(req.MaxSizeMB, req.TTLMinutes, req.LRUEnabled)
+	return nil
+}
+
+func saveOrUpdateCacheConfig(ctx context.Context, key, value string) error {
+	return repository.SaveOrUpdateSystemConfig(ctx, key, value)
+}