refactor: reorganize models to pkg/model and add authentication module

- Move ORM models from internal/model to pkg/model organized by module (auth/k8s/registry)
- Add authentication module with login, user management handlers
- Update all import paths to use new model locations
- Add frontend auth pages (Login, UserManagement) and authStore
- Remove deprecated internal/model/model.go

internal/module/registry/registry.go

@@ -5,7 +5,7 @@ import (
 	"log"
 	"strings"
 
-	"gitea.loveuer.com/loveuer/cluster/internal/model"
+	registry "gitea.loveuer.com/loveuer/cluster/pkg/model/registry"
 	"gitea.loveuer.com/loveuer/cluster/pkg/resp"
 	"gitea.loveuer.com/loveuer/cluster/pkg/store"
 	"github.com/gofiber/fiber/v3"
@@ -14,12 +14,12 @@ import (
 
 func Registry(ctx context.Context, db *gorm.DB, store store.Store) fiber.Handler {
 	if err := db.AutoMigrate(
-		&model.Repository{},
-		&model.Blob{},
-		&model.Manifest{},
-		&model.Tag{},
-		&model.BlobUpload{},
-		&model.RegistryConfig{},
+		&registry.Repository{},
+		&registry.Blob{},
+		&registry.Manifest{},
+		&registry.Tag{},
+		&registry.BlobUpload{},
+		&registry.RegistryConfig{},
 	); err != nil {
 		log.Fatalf("failed to migrate database: %v", err)
 	}