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

cmd/banner_test.go

@@ -0,0 +1,57 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package cmd
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/Rain-kl/Wavelet/pkg/buildinfo"
+	"github.com/Rain-kl/Wavelet/pkg/config"
+	"github.com/Rain-kl/Wavelet/pkg/persistence/migrator"
+)
+
+func TestFormatStartupBanner(t *testing.T) {
+	previousVersion := buildinfo.Version
+	previousBuildTime := buildinfo.BuildTime
+	previousEnv := config.Config.App.Env
+	previousAddr := config.Config.App.Addr
+	t.Cleanup(func() {
+		buildinfo.Version = previousVersion
+		buildinfo.BuildTime = previousBuildTime
+		config.Config.App.Env = previousEnv
+		config.Config.App.Addr = previousAddr
+	})
+
+	buildinfo.Version = "v3.2.1"
+	buildinfo.BuildTime = "2026-07-13T08:00:00Z"
+	config.Config.App.Env = "production"
+	config.Config.App.Addr = ":3000"
+
+	banner := formatStartupBanner(startupState{
+		mode: "API",
+		relationalDB: migrator.Report{
+			Backend: "PostgreSQL",
+			Enabled: true,
+			Version: 202607150003,
+			Applied: true,
+		},
+		clickHouseDB:   migrator.Report{Backend: "ClickHouse"},
+		listensForHTTP: true,
+	})
+
+	for _, want := range []string{
+		"Wavelet v3.2.1",
+		"Environment: production",
+		"Build time:  2026-07-13T08:00:00Z",
+		"Database:    PostgreSQL (version 202607150003, upgraded)",
+		"Analytics:   disabled",
+		"Listening:   http://:3000",
+		"Mode:        API",
+	} {
+		if !strings.Contains(banner, want) {
+			t.Errorf("banner missing %q:\n%s", want, banner)
+		}
+	}
+}