feat: add registry config, image upload/download, and OCI format support

Backend:
- Add registry_address configuration API (GET/POST)
- Add tar image upload with OCI and Docker format support
- Add image download with streaming optimization
- Fix blob download using c.Send (Fiber v3 SendStream bug)
- Add registry_address prefix stripping for all OCI v2 endpoints
- Add AGENTS.md for project documentation

Frontend:
- Add settings store with Snackbar notifications
- Add image upload dialog with progress bar
- Add download state tracking with multi-stage feedback
- Replace alert() with MUI Snackbar messages
- Display image names without registry_address prefix

🤖 Generated with [Qoder](https://qoder.com)

internal/module/registry/manifest.go

@@ -75,6 +75,17 @@ func HandleManifest(c fiber.Ctx, db *gorm.DB, store store.Store) error {
 
 	// ???? manifests ???????
 	repo := strings.Join(parts[:manifestsIndex], "/")
+	
+	// Strip registry_address prefix from repo if present
+	var registryConfig model.RegistryConfig
+	registryAddress := ""
+	if err := db.Where("key = ?", "registry_address").First(&registryConfig).Error; err == nil {
+		registryAddress = registryConfig.Value
+	}
+	if registryAddress != "" && strings.HasPrefix(repo, registryAddress+"/") {
+		repo = strings.TrimPrefix(repo, registryAddress+"/")
+	}
+	
 	// tag ? manifests ?????
 	tag := parts[manifestsIndex+1]