[feat] support Kubernetes Gateway API

[eye-gu]

close #6346

Implements ShenYu support for Kubernetes Gateway API (gateway.networking.k8s.io/v1), complementing the existing Ingress support.

Core Components

Component	Description
GatewayClassReconciler	Watches GatewayClass, accepts those with spec.controllerName=shenyu
GatewayReconciler	Watches Gateway, re-queues affected HTTPRoutes on Gateway changes
HTTPRouteReconciler	Watches HTTPRoute, parses into ShenYu selector/rule via HttpRouteParser
HttpRouteParser	Translates HTTPRoute spec (hostnames + matches + backendRefs) into SelectorData/RuleData
GatewayRouteCache	Thread-safe cache for route↔selector and gateway↔route bindings
GatewayApiControllerConfiguration	Spring Boot auto-configuration for all Gateway API beans

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[Copilot]

Pull request overview

Adds Kubernetes Gateway API (gateway.networking.k8s.io/v1) support to ShenYu’s k8s controller/starter, alongside existing Ingress support, and introduces a new integrated test workflow to validate Gateway API routing.

Changes:

• Adds Spring Boot auto-configuration and controllers/reconcilers for GatewayClass, Gateway, and HTTPRoute.
• Implements HttpRouteParser + GatewayRouteCache to translate HTTPRoute specs into ShenYu selector/rule config and track bindings.
• Introduces a new k8s Gateway API integrated test module and GitHub Actions workflow to run it on kind.

Reviewed changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
shenyu-spring-boot-starter/shenyu-spring-boot-starter-k8s/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports	Registers the new Gateway API auto-configuration.
shenyu-spring-boot-starter/shenyu-spring-boot-starter-k8s/src/main/resources/META-INF/spring.factories	Registers Gateway API auto-configuration for legacy Spring Boot loading.
shenyu-spring-boot-starter/shenyu-spring-boot-starter-k8s/src/main/java/org/apache/shenyu/springboot/starter/k8s/IngressControllerConfiguration.java	Adds shenyu.k8s.mode gating and fixes default secret TLS loading condition.
shenyu-spring-boot-starter/shenyu-spring-boot-starter-k8s/src/main/java/org/apache/shenyu/springboot/starter/k8s/GatewayApiControllerConfiguration.java	New Gateway API controller wiring (informers/controllers/reconcilers/repository bootstrap).
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/reconciler/GatewayClassReconciler.java	New GatewayClass reconciliation + status patch + requeue logic.
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/reconciler/GatewayReconciler.java	New Gateway reconciliation, status patching, and HTTPRoute requeueing.
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/reconciler/HTTPRouteReconciler.java	New HTTPRoute reconciliation, config apply/delete, binding, and status patching.
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/parser/HttpRouteParser.java	New HTTPRoute→selector/rule translation logic.
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/common/GatewayApiConstants.java	Gateway API constants + shared condition helper.
shenyu-kubernetes-controller/src/main/java/org/apache/shenyu/k8s/cache/GatewayRouteCache.java	New thread-safe cache for route↔selector and gateway↔route bindings.
shenyu-kubernetes-controller/src/test/java/org/apache/shenyu/k8s/GatewayReconcilerTest.java	Unit tests for Gateway reconciliation behaviors.
shenyu-kubernetes-controller/src/test/java/org/apache/shenyu/k8s/HTTPRouteReconcilerTest.java	Unit tests for HTTPRoute reconciliation behaviors.
shenyu-kubernetes-controller/src/test/java/org/apache/shenyu/k8s/HttpRouteParserTest.java	Unit tests for HTTPRoute parsing/mapping logic.
shenyu-integrated-test/pom.xml	Adds the new Gateway API integrated test module to the build.
shenyu-integrated-test/shenyu-integrated-test-k8s-gateway-api-http/**	New integrated test module (app, config, Dockerfile, kind manifests, scripts, tests).
shenyu-examples/shenyu-examples-http/k8s/gateway-api.yml	Example GatewayClass/Gateway/HTTPRoute manifests for the HTTP example.
.github/workflows/integrated-test-k8s-gateway-api.yml	New CI workflow to run Gateway API integrated tests on kind.

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