POC feat: add dynamic category navigation via header-dynamic block and nav-sync workflow

[OscarMerino]

Summary:
Adds a complete dynamic category navigation solution. Merchants can generate storefront navigation automatically from their Commerce category tree without manual authoring in da.live.

What's included:

• blocks/header-dynamic/: Fork of the header block that fetches a published nav-dynamic.json at runtime and builds the nav menu from it. Falls back to the static /nav document if the fetch fails or returns nothing. Kept separate from the header to avoid modifying the boilerplate default. scripts.js is updated to autoblock header-dynamic instead of header.
• tools/nav-sync/: A Node.js script that queries the ACO Catalog Service navigation GraphQL API, flattens the category tree, and uploads the result to da.live. Supports a --mode flag (local, preview, publish) and both local (DA_TOKEN) and CI (DA_CLIENT_ID / DA_CLIENT_SECRET) auth.
• .github/workflows/sync-nav.yml: Daily scheduled workflow with manual trigger support. Update NAV_SITE and NAV_FAMILY before enabling.

Notes:

• ACO-specific: ACCS requires a separate implementation.
• Merchants can edit nav-dynamic.json in da.live and disable the schedule to prevent overwrites.
• Reference how-to guide: Experience League: Dynamic Category Navigation

Ticket:
COMOPT-1958

Test URLs:

• Before: https://main--aem-boilerplate-commerce--hlxsites.aem.page/
• After: https://POC-COMOPT-1958--aem-boilerplate-commerce--hlxsites.aem.page/

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