feat(API): add pre_translations resource to API

[Phrase (phrase-bot)]

This PR was generated by the openapi-apply agent in response to a
/openapi-sync apply request on
Phrase-Engineering/strings-app#18257.

What changed in the API

• GET /api/v2/projects/{project_id}/pre_translations — new list endpoint returning all pre-translation jobs scoped to a project, paginated (Link header), requires read scope and autopilot plan feature.
• POST /api/v2/projects/{project_id}/pre_translations — new create endpoint that enqueues a pre-translation job for a polymorphic target (locale, job, translation_key, or upload); responds 202 Accepted, requires write scope and autopilot plan feature.
• GET /api/v2/projects/{project_id}/pre_translations/{id} — new show endpoint returning a single pre-translation job by its code, requires read scope and autopilot plan feature.

Notes for reviewers

• operationId for show and create actions uses the singular form (pre_translation/show, pre_translation/create) consistent with the existing repo convention (e.g. automation/show, upload/create); the proposal used the plural form for all three but only the list action takes plural by convention.
• No security override was added to the path files — security is inherited from the root definition in main.yaml, consistent with all other path files in the repo.
• npx swagger-cli validate main.yaml passed cleanly after applying all changes.

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Opened automatically by the openapi-apply agent. Review the spec changes
against the linked strings-app PR; the agent does not vouch for correctness
beyond "the YAML parsed and the documented layout was followed."

[github-actions]

API changelog (oasdiff)

Doc-only edits (descriptions, examples) do not appear here.

3 changes: 0 error, 0 warning, 3 info
info	[endpoint-added] at doc/compiled.json
	in API GET /projects/{project_id}/pre_translations
		endpoint added

info	[endpoint-added] at doc/compiled.json
	in API POST /projects/{project_id}/pre_translations
		endpoint added

info	[endpoint-added] at doc/compiled.json
	in API GET /projects/{project_id}/pre_translations/{id}
		endpoint added