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

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

internal/module/registry/referrer.go

@@ -0,0 +1,16 @@
+package registry
+
+import (
+	"gitea.loveuer.com/loveuer/cluster/pkg/resp"
+	"gitea.loveuer.com/loveuer/cluster/pkg/store"
+	"github.com/gofiber/fiber/v3"
+	"gorm.io/gorm"
+)
+
+// HandleReferrers ?? referrers ???OCI ???
+// GET /v2/{repo}/referrers/{digest}
+func HandleReferrers(c fiber.Ctx, db *gorm.DB, store store.Store) error {
+	// TODO: ?? OCI referrers API
+	// ????????????? OCI ? referrers ??
+	return resp.R501(c, "NOT_IMPLEMENTED", nil, "referrers API not implemented yet")
+}