Fetch the latest spec body for a team-scoped private API

Returns the OpenAPI document content (YAML or JSON, as published) for the latest version of a team-scoped private API. Mirrors the public-registry equivalent (GET /api/v1/public/registry/{orgSlug}/{apiName}) but resolves the API by its internal UUID so callers can target private APIs without a public org slug.

Authorization stack:

• scope: read:specs
• ABAC v2: caller must be permitted to view the API resource (cross-org and cross-team isolation collapse to 404 to avoid leaking existence).

Backs spec0 pull --team (issue #149).

curl -X GET "https://app.spec0.io/api/v1/public/apis/team/497f6eca-6276-4993-bfeb-53cbbbba6f08/spec"

"string"

{
  "error": "string",
  "message": "string"
}

{
  "status": 0,
  "title": "string",
  "detail": "string",
  "type": "string",
  "instance": "string"
}

{
  "status": 0,
  "title": "string",
  "detail": "string",
  "type": "string",
  "instance": "string"
}