chore(plugin-webhooks): drop the dead sys_webhook_delivery i18n blocks

[os-zhuang]

What

sys_webhook_delivery was removed from @objectstack/plugin-webhooks when outbound delivery moved to @objectstack/service-messaging (sys_http_delivery, ADR-0018 M3). But its stale i18n translation blocks lingered in all four generated locale bundles — loaded at runtime yet referenced by nothing, since the object no longer exists in this plugin.

Changes

• Bundles (en / zh-CN / ja-JP / es-ES *.objects.generated.ts): removed the entire sys_webhook_delivery node (−111 lines each). WebhooksTranslations now carries only sys_webhook.
• scripts/i18n-extract.config.ts: dropped the dangling SysWebhookDelivery import (it pointed at the deleted sys-webhook-delivery.object.js, which broke the documented os i18n extract regeneration command) and the objects-array entry. It now extracts SysWebhook only.
• src/sys-webhook.object.ts: corrected the stale ownership comment that still named sys_webhook_delivery as a live sibling; it now points at the service-messaging sys_http_delivery migration.

Note: the PR description's premise that the config was "already fixed in #3461" did not hold — #3461 is an open issue (spec WebhookSchema ↔ dispatcher disconnect), not a merged PR, so the config still had the dangling import. That's fixed here, so the header's os i18n extract command resolves cleanly again.

Verification

• pnpm turbo build --filter=@objectstack/plugin-webhooks --force → green (ESM + CJS + DTS, i.e. a real tsc type-check).
• Loaded the built ESM bundle: every locale's objects map is exactly ["sys_webhook"]; sys_webhook_delivery absent from the compiled output.
• pnpm test (vitest) → 14/14 pass.
• No remaining sys_webhook_delivery / SysWebhookDelivery references in the plugin's src or scripts.

Out of scope (flagged separately)

Two stale doc comments in the platform-objects package (src/integration/index.ts, src/apps/setup.app.ts) still name sys_webhook_delivery as a plugin-webhooks object — left out to keep this change scoped to plugin-webhooks; being handled in a separate cleanup. The service-messaging/http-delivery.object.ts old→new field-mapping note is intentional and untouched.

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Project	Deployment	Actions	Updated (UTC)
spec	Ready	Preview, Comment	Jul 26, 2026 7:30am

[github-actions]

📓 Docs Drift Check

This PR changes 1 package(s): @objectstack/plugin-webhooks.

3 hand-written doc(s) reference the affected code and may need an implementation-accuracy re-verification:

• content/docs/automation/webhooks.mdx (via packages/plugins/plugin-webhooks)
• content/docs/plugins/packages.mdx (via @objectstack/plugin-webhooks)
• content/docs/releases/implementation-status.mdx (via @objectstack/plugin-webhooks)

Advisory only. To re-verify, run the docs-accuracy-audit workflow scoped to these files:
node scripts/docs-audit/affected-docs.mjs origin/main → pass the list as args.docs.