docs: use canonical public sites in active guides

[anycodes]

Description

Active bilingual documentation indexes/provider guides still link to the .com registry, which does not resolve from the release-review environment, and the older .com website. Use the verified canonical .cn destinations consistently, including CLI engine/installation references where applicable.

Type of Change

• Documentation

Changes

• Correct active English/Chinese links; preserve historical archive/design records and runtime endpoints.
• Add current owner evidence/CHANGELOG and reconcile the accepted CLI release-boundary record lifecycle where applicable.

Testing

• Canonical website/registry HTTP200, existing bilingual public content and provider archive hashes independently verified.
• Repository health/hygiene/diff checks PASS (exact counts in evidence).
• Latest-head hosted CI and merge review

Checklist

• Scope is documentation/records only; no runtime, dependency, DNS, release, credential or visibility change.

Definition of Done

• Bilingual guides/CHANGELOG and own .agents/ verification/decision records included.
• No new cloud/model test for link-only edits; existing product acceptance is preserved as immutable history.

Evidence: .agents/evidence/verify/2026-10-19-canonical-guide-links.md. Normal Registry documentation aggregation must read the accepted source after merge; a green PR alone does not prove the live docs updated.

Also correct the catalog module introduction docstring. Its executable REGISTRY_INDEX was already canonical and remains unchanged; no behavior change or cloud rerun is needed.