refactor(architecture): eliminate internal package and complete cordis single-owner model and repository migration

- Physically purged all legacy internal/ packages, centralized pkg/model/ and pkg/repository/
- Migrated domain models and database repositories into self-contained owner plugins (user, auth, message_gateway, admin, upload, risk_control)
- Decoupled cross-plugin interactions via pure core/contracts and typed EventBus
- Ensured 100% test coverage pass, zero data races (-race clean), and 0 lint issues in make code-check

plugins/infra/cache/plugin.go

@@ -1,3 +1,6 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
 // Package cache provides the multi-tier caching infrastructure plugin for Cordis.
 package cache
 
@@ -10,8 +13,8 @@ import (
 
 	"github.com/Rain-kl/Wavelet/core"
 	"github.com/Rain-kl/Wavelet/core/contracts"
-	"github.com/Rain-kl/Wavelet/internal/infra/persistence"
 	"github.com/Rain-kl/Wavelet/pkg/cache/ram"
+	"github.com/Rain-kl/Wavelet/pkg/persistence"
 	"github.com/Rain-kl/Wavelet/pkg/util"
 	"github.com/redis/go-redis/v9"
 )