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.config.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"encoding/json"
 
-	"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"
@@ -14,7 +14,7 @@ import (
 // RegistryConfigGet returns the registry configuration
 func RegistryConfigGet(ctx context.Context, db *gorm.DB, store store.Store) fiber.Handler {
 	return func(c fiber.Ctx) error {
-		var configs []model.RegistryConfig
+		var configs []registry.RegistryConfig
 		if err := db.Find(&configs).Error; err != nil {
 			return resp.R500(c, "", nil, err)
 		}
@@ -53,11 +53,11 @@ func RegistryConfigSet(ctx context.Context, db *gorm.DB, store store.Store) fibe
 		}
 
 		// Find or create config
-		var config model.RegistryConfig
+		var config registry.RegistryConfig
 		err := db.Where("key = ?", req.Key).First(&config).Error
 		if err == gorm.ErrRecordNotFound {
 			// Create new config
-			config = model.RegistryConfig{
+			config = registry.RegistryConfig{
 				Key:   req.Key,
 				Value: req.Value,
 			}