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.fetch.go

@@ -14,7 +14,7 @@ import (
 	"strings"
 	"time"
 
-	"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"
@@ -161,7 +161,7 @@ func pullImage(ctx context.Context, db *gorm.DB, store store.Store, repo string,
 	log.Printf("[PullImage] Got manifest with %d layers", len(manifest.Layers))
 
 	// Create repository
-	if err := db.FirstOrCreate(&model.Repository{}, model.Repository{Name: repo}).Error; err != nil {
+	if err := db.FirstOrCreate(&registry.Repository{}, registry.Repository{Name: repo}).Error; err != nil {
 		return nil, fmt.Errorf("failed to create repository: %w", err)
 	}
 
@@ -195,7 +195,7 @@ func pullImage(ctx context.Context, db *gorm.DB, store store.Store, repo string,
 		return nil, fmt.Errorf("failed to write config blob: %w", err)
 	}
 
-	if err := db.Create(&model.Blob{
+	if err := db.Create(&registry.Blob{
 		Digest:     digest,
 		Size:       manifest.Config.Size,
 		MediaType:  "application/vnd.docker.container.image.v1+json",
@@ -229,7 +229,7 @@ func pullImage(ctx context.Context, db *gorm.DB, store store.Store, repo string,
 			return nil, fmt.Errorf("failed to write layer blob %d: %w", idx, err)
 		}
 
-		if err := db.Create(&model.Blob{
+		if err := db.Create(&registry.Blob{
 			Digest:     layerDigest,
 			Size:       layerDesc.Size,
 			MediaType:  string(layerDesc.MediaType),
@@ -275,7 +275,7 @@ func pullImage(ctx context.Context, db *gorm.DB, store store.Store, repo string,
 		return nil, fmt.Errorf("failed to write manifest: %w", err)
 	}
 
-	if err := db.Create(&model.Manifest{
+	if err := db.Create(&registry.Manifest{
 		Repository: repo,
 		Tag:        tag,
 		Digest:     manifestDigest,
@@ -286,7 +286,7 @@ func pullImage(ctx context.Context, db *gorm.DB, store store.Store, repo string,
 		return nil, fmt.Errorf("failed to save manifest: %w", err)
 	}
 
-	if err := db.Create(&model.Tag{
+	if err := db.Create(&registry.Tag{
 		Repository: repo,
 		Tag:        tag,
 		Digest:     manifestDigest,