feat: complete OCI registry implementation with docker push/pull support

A lightweight OCI (Open Container Initiative) registry implementation written in Go.

internal/module/registry/handler.list.go

@@ -0,0 +1,55 @@
+package registry
+
+import (
+	"context"
+
+	"gitea.loveuer.com/loveuer/cluster/internal/model"
+	"gitea.loveuer.com/loveuer/cluster/pkg/resp"
+	"gitea.loveuer.com/loveuer/cluster/pkg/store"
+	"github.com/gofiber/fiber/v3"
+	"gorm.io/gorm"
+)
+
+// RegistryImageList returns the list of images/repositories
+func RegistryImageList(ctx context.Context, db *gorm.DB, store store.Store) fiber.Handler {
+	return func(c fiber.Ctx) error {
+		var repositories []model.Repository
+
+		// Query all repositories from the database
+		if err := db.Find(&repositories).Error; err != nil {
+			return resp.R500(c, "", nil, err)
+		}
+
+		// Convert to the expected format for the frontend
+		var result []map[string]interface{}
+		for _, repo := range repositories {
+			// Calculate total size of all blobs for this repository
+			var totalSize int64
+			var sizeResult struct {
+				Total int64
+			}
+			err := db.Model(&model.Blob{}).
+				Where("repository = ?", repo.Name).
+				Select("COALESCE(SUM(size), 0) as total").
+				Scan(&sizeResult).Error
+			if err == nil {
+				totalSize = sizeResult.Total
+			}
+
+			// Format updated_at to second precision
+			uploadTime := repo.UpdatedAt.Format("2006-01-02 15:04:05")
+
+			repoMap := map[string]interface{}{
+				"id":          repo.ID,
+				"name":        repo.Name,
+				"upload_time": uploadTime,
+				"size":        totalSize,
+			}
+			result = append(result, repoMap)
+		}
+
+		return resp.R200(c, map[string]interface{}{
+			"images": result,
+		})
+	}
+}