feat: rollout support inline batch strategy

[youngLiuHY]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y

2. What is the scope of this PR (e.g. component or file name):

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

6. Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[Copilot]

Pull request overview

Adds support for defining batch rollout strategy inline in Rollout (in addition to existing StrategyRef), and wires it through RolloutRun construction + one-time strategy handling, with accompanying unit/integration tests and CRD schema updates.

Changes:

• Add inline batch strategy (spec.batchStrategy) support and prefer inline configuration when present.
• Extend one-time strategy representation to carry inline batch strategy and apply it to in-flight RolloutRuns.
• Add validation + new tests (unit and envtest/Ginkgo) and regenerate Rollout CRD schema.

Reviewed changes

Copilot reviewed 19 out of 21 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
pkg/workload/info.go	Tighten strict readiness check to also fail when terminating replicas exist.
pkg/features/ontimestrategy/ontimestrategy.go	Extend one-time strategy struct to support inline batch strategy.
pkg/controllers/rollout/utils.go	Prefer constructing RolloutRun from inline strategy before StrategyRef.
pkg/controllers/rollout/inline_strategy.go	New helper to build RolloutRun spec from inline canary/batch strategy.
pkg/controllers/rollout/rollout_controller.go	Skip fetching RolloutStrategy for inline batch; apply one-time strategy from either StrategyRef or inline batch.
apis/rollout/v1alpha1/validation/rollout.go	Add RolloutSpec validation for strategy selection/mutual exclusion and validate inline strategies.
apis/rollout/v1alpha1/validation/rollout_test.go	Add validation tests for inline batch and mutual exclusion.
pkg/controllers/rollout/utils_test.go	Add unit tests for RolloutRun construction precedence.
pkg/controllers/rollout/suite_test.go	New envtest/Ginkgo suite bootstrap for rollout controller integration tests.
pkg/controllers/rollout/rollout_controller_test.go	New integration tests around StrategyRef, inline strategy, triggers, and status behavior.
config/crd/bases/rollout.kusionstack.io_rollouts.yaml	Regenerated CRD OpenAPI schema including inline canary/batch strategy fields.
go.mod / go.sum	Bump kube-api dependency to a newer pseudo-version.
CLAUDE.md + pkg/controllers/**/CLAUDE.md + .claude/rules/*	Add developer workflow/docs (non-runtime).

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