feat: support empty repo for image registry

[Levi080513]

Issues

Changes

Support empty repo image registry for better compatibility. After that, we can easily use Docker Hub public image, the example config like this:

apiVersion: v1
kind: ImageRegistry
metadata:
  name: empty-repo
  workspace: default
spec:
  repository: ''
  url: https://docker.io

Test

ssh cluster and kubernetes cluster test passed, also the endpoint deploy on kubernetes test passed.

[codecov]

Codecov Report

❌ Patch coverage is 53.33333% with 21 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/registry/image.go	0.00%	13 Missing ⚠️
controllers/image_registry_controller.go	50.00%	5 Missing and 3 partials ⚠️

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[Copilot]

Pull request overview

This PR adds support for empty repository fields in image registries, enabling more flexible Docker image naming conventions. The change allows users to configure image registries with just a URL (e.g., registry.example.com) without requiring a repository prefix, while also standardizing image paths to include organization/project names.

Key Changes:

• Modified GetImagePrefix utility to handle empty repository fields, returning just the registry host when repository is empty
• Updated image naming convention to include organization names in the image path (e.g., /neutree/, /victoriametrics/, /vllm/)
• Removed database validation that previously required the repository field to be non-empty

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/util/image_registry.go	Added validation for empty host and logic to return just the host when repository is empty
internal/util/image_registry_test.go	Added test cases for empty repository and invalid URL validation
internal/cluster/ray_ssh_operation.go	Refactored to use GetImagePrefix utility and updated image path to include /neutree/
internal/cluster/ray_ssh_operation_test.go	Updated test expectations to match new image naming convention with organization names
internal/cluster/component/router/manifests.go	Updated router image path to include /neutree/ prefix
internal/cluster/component/router/route_resource_test.go	Updated test expectation for router image path
internal/cluster/component/metrics/manifests.go	Updated vmagent image path to include /victoriametrics/ prefix
internal/cluster/component/metrics/metrics_resource_test.go	Updated test expectation for vmagent image path
internal/accelerator/plugin/gpu.go	Updated engine image names to use official image paths (e.g., vllm/vllm-openai)
internal/accelerator/plugin/amd_gpu.go	Updated AMD GPU engine image names and versions for vLLM and llama-cpp
db/migrations/030_support_empty_repo.up.sql	Removed trigger and function that validated repository field as required
db/migrations/030_support_empty_repo.down.sql	Rollback migration to restore repository validation

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