feat(argocd): add GET /argocdApp/{id}/manifest endpoint

[fabienfleureau]

Summary

• Add GET /argocdApp/{argocdAppId}/manifest endpoint returning manifest enrichment data
• Add ArgocdAppManifestResponse schema with manifest_revision and manifest_metadata (contains managed_resources array)
• Add ArgocdManagedResource schema with kind, name, namespace, targetState, liveState

Test plan

• Schema validates (YAML is well-formed)
• New path and schemas visible in generated API docs

[Copilot]

Pull request overview

Adds a new ArgoCD API surface to retrieve “manifest enrichment” data for an ArgoCD app, and aligns websocket service typing with existing service types.

Changes:

• Added GET /argocdApp/{argocdAppId}/manifest returning ArgocdAppManifestResponse.
• Introduced ArgocdAppManifestResponse and ArgocdManagedResource schemas for managed resource metadata and states.
• Extended websocket ServiceType enum with ARGOCD_APP.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
openapi.yaml	Adds the new ArgoCD manifest endpoint and its response/resource schemas.
websocket/websocket-openapi.yaml	Adds ARGOCD_APP to the websocket ServiceType enum.

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