fix(operator): stage DGD admission path migration

[sttts]

Summary

• Serve both legacy v1alpha1 and v1beta1 DGD admission endpoints.
• Convert v1alpha1 admission objects to the v1beta1 hub before validation and defaulting.
• Keep Helm registered on the v1alpha1 routes through 1.3, so the v1beta1 route change can safely happen in 1.4.

Validation

• GOCACHE=/private/tmp/dynamo-go-cache go test ./internal/webhook/...
• helm lint .
• helm template dynamo-operator . --namespace dynamo-system --set discoveryBackend=kubernetes

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Summary by CodeRabbit

• New Features

  • Added compatibility support for DynamoGraphDeployment admission webhooks across both the older and newer API versions.
  • Enabled defaulting and validation to work through either endpoint during the transition period.

• Bug Fixes

  • Ensured objects continue to receive the expected default replicas and origin/version metadata.
  • Preserved validation behavior for invalid replica values when using the older API version.

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[github-actions]

👋 Hi sttts! Thank you for contributing to ai-dynamo/dynamo.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[coderabbitai]

Walkthrough

Adds v1alpha1 compatibility endpoints for DynamoGraphDeployment admission webhooks (defaulting and validation) alongside existing v1beta1 endpoints, introducing conversion helpers between the two API versions, dual webhook registration, updated Helm webhook configuration paths/apiVersions, and corresponding tests.

Changes

v1alpha1 webhook dual-registration

Layer / File(s)	Summary
Conversion helpers deploy/operator/internal/webhook/dynamographdeployment_conversion.go	New file adds ConvertDynamoGraphDeploymentToV1Beta1 and ConvertDynamoGraphDeploymentToV1Alpha1 functions translating DynamoGraphDeployment between v1alpha1 and v1beta1.
Defaulting webhook dual endpoint deploy/operator/internal/webhook/defaulting/dynamographdeployment_handler.go, ...handler_test.go	Refactors DGDDefaulter.Default into defaultV1Beta1, adds dgdV1Alpha1Defaulter that converts, applies defaulting, converts back, and registers both v1alpha1 and v1beta1 mutating webhook endpoints; adds a test for the new alpha defaulter.
Validation webhook dual endpoint deploy/operator/internal/webhook/validation/dynamographdeployment_handler.go, ...handler_test.go	Generalizes ValidateCreate/Update/Delete to accept an expectedGVK, adds dynamoGraphDeploymentV1Alpha1Handler, expands casting/metadata helpers to accept either API version, and registers both webhook routes via a shared helper; adds a test validating negative replicas via the alpha handler.
Helm webhook configuration update deploy/helm/charts/platform/components/operator/templates/webhook-configuration.yaml	Updates ValidatingWebhookConfiguration and MutatingWebhookConfiguration entries for DynamoGraphDeployment to use v1alpha1 paths and apiVersions with explanatory comments.

Estimated code review effort: 4 (Complex) | ~55 minutes

Related Issues: None referenced.

Related PRs: None referenced.

Suggested labels: operator, webhook, api-versioning

Suggested reviewers: None specified.

Poem

A rabbit hops through webhook lanes,
alpha and beta, twin refrains,
converting shapes with careful paws,
defaulting, validating, no pause,
until 1.4, both paths remain.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description covers summary and validation, but it omits required template sections like Overview, Details, reviewer start, and related issues.	Add the required sections from the template: Overview, Details, Where should reviewer start?, and Related Issues with an issue link or no-issue confirmation.
Docstring Coverage	⚠️ Warning	Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: staging the DGD admission path migration.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (2.12.2)

level=error msg="[linters_context] typechecking error: pattern ./...: directory prefix . does not contain main module or its selected dependencies"

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In
`@deploy/operator/internal/webhook/validation/dynamographdeployment_handler.go`:
- Around line 236-242: Map validation errors back to v1alpha1 field names in the
legacy webhook handler. The ValidateCreate and ValidateUpdate paths in the
dynamoGraphDeploymentV1Alpha1Handler currently pass through validator errors
from the hub conversion unchanged, so legacy clients see v1beta1-style paths
such as spec.components instead of the submitted v1alpha1 paths like
spec.services. Update the v1alpha1 wrapper to translate the returned validation
error field paths/messages back to the v1alpha1 schema before returning, using
the handler methods that invoke validateCreate/validateUpdate and any existing
error-mapping helpers in this package.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: daa77a04-bc90-44f2-a200-8ab32d9d4bd5

📥 Commits

Reviewing files that changed from the base of the PR and between b4999c4 and 7d1b90c.

📒 Files selected for processing (6)

• deploy/helm/charts/platform/components/operator/templates/webhook-configuration.yaml
• deploy/operator/internal/webhook/defaulting/dynamographdeployment_handler.go
• deploy/operator/internal/webhook/defaulting/dynamographdeployment_handler_test.go
• deploy/operator/internal/webhook/dynamographdeployment_conversion.go
• deploy/operator/internal/webhook/validation/dynamographdeployment_handler.go
• deploy/operator/internal/webhook/validation/dynamographdeployment_handler_test.go

[sttts]

/ok to test 8c1dc85