fix: testing poc for autofix of summaries opportunity

[nishant803]

Title: feat: apply Summarization suggestions directly to AEM page content

Summary

• Adds POST /sites/:siteId/opportunities/:opportunityId/suggestions/aem-apply, a new endpoint that writes a suggestion's content directly into an AEM CS page's own content tree — editing the human-facing page. This is distinct from the existing edge-deploy endpoint, which only ever writes a bot-targeted overlay at the Tokowaka CDN edge and never touches AEM itself.
• For each suggestion: resolves data.url to an AEM pageId via the existing determineAEMCSPageId resolver (@adobe/spacecat-shared-utils, same one resolveDocumentPath already uses for other opportunity types), fetches the page's content tree + ETag, resolves transformRules.selector against it, and applies transformRules.action (insertAfter / insertBefore / appendChild / replace) as a JSON Patch.
• Handles two shapes of transformRules: a direct target (selector names the existing node to act on — today's Summarization case) and an anchor + tag (selector names an existing anchor, tag names a new heading element to create relative to it — e.g. a "missing heading" fix), so the same endpoint isn't limited to one suggestion archetype.
• Auth: forwards the caller's own bearer token to AEM, the same pattern the existing content-api-access autofix-check probe already uses against this API — no new credential/auth path introduced.
• Scoped to aem_cs delivery-type sites only; returns a 400 otherwise.
• Selector matching is intentionally narrow today (bare tag or tag#id, against title/heading components only) and fails closed — an unresolvable selector or unsupported action returns a per-suggestion 404/422 in the 207 response rather than guessing a placement.

[github-actions]

This PR will trigger a minor release when merged.

[codecov]

Codecov Report

❌ Patch coverage is 25.49505% with 602 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/controllers/suggestions.js	21.30%	532 Missing ⚠️
src/support/aem-content-mcp-client.js	43.54%	70 Missing ⚠️

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