docs: link SDKs from every Quickstart

[acedatacloud-dev]

Dependency

This PR is intentionally stacked on #80, which labels Quickstart registration traffic. The base PR changes attribution only; this PR adds one SDK next step. Merge/retarget in that order.

Why

All localized Quickstart pages teach a first API request, but none provides a direct next step to the official typed SDKs. The SDK repository already supports Python, TypeScript, and Go, so duplicating SDK documentation inside 18 locale trees would create drift. A single canonical card lets successful Quickstart readers continue into maintained clients.

What changed

• add one language-neutral SDK card before the closing Quickstart CardGroup in all 18 localized pages;
• list the canonical package identities: acedatacloud, @acedatacloud/sdk, and Go;
• link the canonical SDK repository with:
  • utm_source=docs
  • utm_medium=quickstart
  • utm_campaign=docs-sdk
• add a checker requiring exactly one SDK card and all three client identities in every localized Quickstart;
• add three focused tests and include them in the existing Docs validation workflow.

Validation

• base Quickstart acquisition tests — 3/3 passed
• SDK card tests — 3/3 passed
• SDK checker — 18 localized pages covered
• generated-content safeguards — 30/30 passed
• navigation validator — schema OK, 15 navigated languages
• git diff feat/attribute-quickstart-acquisition...HEAD --check — clean

Scope boundaries

This PR does not duplicate SDK guides, change Quickstart examples, alter navigation, translate new prose, or modify SDK code. The title and package names are intentionally language-neutral. It is independent of future dedicated SDK landing pages.

Rollback

Revert this commit to remove the card/checker while keeping the base acquisition attribution intact.

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