feat: support apisixupstream

[dspo]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches
• Documentation
• Refactor
• Chore
• CI/CD or Tests

What this PR does / why we need it:

实现了 ApisixRoute 引用 ApisixUpstream 的基本业务逻辑和添加了基本的测试。
更多的细节和测试在下个 PR 中提出。

.Status 在这个 PR 中被删除了，将在下个 PR 中增加回来。

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[github-actions]

conformance test report

apiVersion: gateway.networking.k8s.io/v1
date: "2025-06-18T12:47:46Z"
gatewayAPIChannel: standard
gatewayAPIVersion: v1.2.0
implementation:
  contact: null
  organization: APISIX
  project: apisix-ingress-controller
  url: https://github.com/apache/apisix-ingress-controller.git
  version: v2.0.0
kind: ConformanceReport
mode: default
profiles:
- core:
    failedTests:
    - HTTPRouteCrossNamespace
    result: failure
    skippedTests:
    - HTTPRouteHTTPSListener
    statistics:
      Failed: 1
      Passed: 31
      Skipped: 1
  name: GATEWAY-HTTP
  summary: Core tests failed with 1 test failures.

[github-actions]

conformance test report

apiVersion: gateway.networking.k8s.io/v1
date: "2025-06-18T12:53:34Z"
gatewayAPIChannel: standard
gatewayAPIVersion: v1.2.0
implementation:
  contact: null
  organization: APISIX
  project: apisix-ingress-controller
  url: https://github.com/apache/apisix-ingress-controller.git
  version: v2.0.0
kind: ConformanceReport
mode: default
profiles:
- core:
    result: partial
    skippedTests:
    - HTTPRouteHTTPSListener
    statistics:
      Failed: 0
      Passed: 32
      Skipped: 1
  name: GATEWAY-HTTP
  summary: Core tests partially succeeded with 1 test skips.

[Copilot]

Pull Request Overview

Adds support for referencing ApisixUpstream from ApisixRoute, including CRD updates, translation logic, controller/indexer adjustments, and an end-to-end test.

• Enable and implement ApisixRoute → ApisixUpstream lookup and translation in ADC translator and controller
• Introduce MatchHostDef for validating domain names and update CRD/types for upstream retries
• Add an e2e test covering externalName vs non-externalName service behavior

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/e2e/apisix/route.go	Unskip and implement e2e test for ApisixRoute referencing upstream
internal/utils/k8s.go	Add MatchHostDef regex and helper
internal/provider/provider.go	Track Upstreams in translation context
internal/provider/adc/translator/apisixupstream.go	New translator for ApisixUpstream
internal/provider/adc/translator/apisixroute.go	Extend route translator to use ApisixUpstream data
internal/controller/indexer/indexer.go	Add field index for ApisixUpstream and update service/secret indexes
internal/controller/apisixupstream_controller.go	Remove stub reconciler (status subresource removed)
internal/controller/apisixroute_controller.go	Wire up ApisixUpstream watch and loading in reconciler
config/crd/bases/apisix.apache.org_apisixupstreams.yaml	Update format for retries, remove status subresource
api/v2/shared_types.go	Add protocol/scheme, load-balancer, hashing constants
api/v2/apisixupstream_types.go	Change Retries to *int64 and remove status field
api/v2/zz_generated.deepcopy.go	Adjust deep-copy logic for updated types
api/adc/types.go & zz_generated.deepcopy.go	Add health-check, TLS, discovery, traffic-split fields and deep-copies

Comments suppressed due to low confidence (1)

api/v2/shared_types.go:123

• [nitpick] The comment for PassHostNode is incorrect (it mentions PassHostPass). Please update the comment to describe Node correctly.

	// PassHostPass represents node option for pass_host Upstream settings.

[ronething]

lgtm