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/handler.list.go

@@ -3,7 +3,7 @@ package registry
 import (
 	"context"
 
-	"gitea.loveuer.com/loveuer/cluster/internal/model"
+	"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"
@@ -17,7 +17,7 @@ func RegistryImageList(ctx context.Context, db *gorm.DB, store store.Store) fibe
 		filter := c.Query("filter", "")
 		
 		// Get current registry_address setting
-		var registryConfig model.RegistryConfig
+		var registryConfig registry.RegistryConfig
 		registryAddress := ""
 		if err := db.Where("key = ?", "registry_address").First(&registryConfig).Error; err == nil {
 			registryAddress = registryConfig.Value
@@ -26,7 +26,7 @@ func RegistryImageList(ctx context.Context, db *gorm.DB, store store.Store) fibe
 			registryAddress = "localhost:9119"
 		}
 
-		var repositories []model.Repository
+		var repositories []registry.Repository
 
 		// Query all repositories from the database
 		query := db
@@ -41,7 +41,7 @@ func RegistryImageList(ctx context.Context, db *gorm.DB, store store.Store) fibe
 		var result []map[string]interface{}
 		for _, repo := range repositories {
 			// Get all tags for this repository
-			var tags []model.Tag
+			var tags []registry.Tag
 			if err := db.Where("repository = ?", repo.Name).Find(&tags).Error; err != nil {
 				continue // Skip this repository if we can't get tags
 			}
@@ -56,7 +56,7 @@ func RegistryImageList(ctx context.Context, db *gorm.DB, store store.Store) fibe
 			var sizeResult struct {
 				Total int64
 			}
-			err := db.Model(&model.Blob{}).
+			err := db.Model(&registry.Blob{}).
 				Where("repository = ?", repo.Name).
 				Select("COALESCE(SUM(size), 0) as total").
 				Scan(&sizeResult).Error