fix(ci): let locale finalizers queue independently

[vincentkoc]

What Problem This Solves

Full translation runs still cancel locale finalizers when several locale artifacts finish close together. GitHub Actions concurrency groups allow only one running and one pending job per group, so the shared docs-i18n-finalize group cancels older pending per-locale finalizers before they can commit their artifacts.

Observed on https://github.com/openclaw/docs/actions/runs/28285982968: Full batch 1 (zh-TW, zh-tw) / Finalize zh-TW artifact was cancelled with Canceling since a higher priority waiting request for docs-i18n-finalize exists while other locale finalizers continued.

Why This Change Was Made

The per-locale finalizer no longer uses the shared Actions concurrency group. Its commit script already handles the real contention point by fetching latest main, rebasing, checking source metadata, retrying push conflicts, and skipping stale artifacts safely.

Because parallel finalizers can now dispatch locale R2 deploys concurrently, R2 dispatches also get a unique request_id in the workflow run title. The waiter resolves the exact R2 run by that request id instead of treating concurrent workflow_dispatch runs as ambiguous.

Scoped R2 deploys now fail when their content goes stale before upload, and the dispatch waiter retries them against latest main. That keeps locale commits from silently skipping their scoped publish when another locale commit lands during build.

User Impact

Full docs translation runs can publish all completed locale artifacts instead of dropping older pending finalizers or silently skipping scoped uploads when multiple locales finish around the same time.

Evidence

• python3 .github/scripts/i18n/tests/test_i18n_scripts.py (Ran 42 tests, OK)
• git diff --check

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[vincentkoc]

Land-ready proof for this finalizer/concurrent deploy fix:

• Local: python3 .github/scripts/i18n/tests/test_i18n_scripts.py (Ran 42 tests, OK)
• Local: git diff --check
• Autoreview: clean, no accepted/actionable findings
• CI: CodeQL analyze (actions), CodeQL analyze (javascript-typescript), and CodeQL all passed on 1ca951e74c0c47cb539fbeb1731d4ee555026b61

This fixes the observed docs-i18n-finalize pending-job cancellation in https://github.com/openclaw/docs/actions/runs/28285982968 and also keeps scoped R2 deploy resolution/retry safe once finalizers run independently.