feat(seo): restore /odoo-n8n-masterclass/ and /workshops/, both 404ing but indexed

Two directory URLs Google still has indexed were 404ing after the old site was
torn down. Both are rebuilt as trailing-slash directories (same model as
/odoo-erp-automation-bootcamp/, so the non-slash form 301s to the slash form).

odoo-n8n-masterclass/index.html
- copy from copywriter, structure and page-scoped CSS reused from the bootcamp page
- next session: four Thursdays of February 2027, 17:00 Central Time (hero eyebrow,
  price and booking, JSON-LD startDate 2027-02-04)
- booking: native POST form to 20.odoo4projects.com/shop/post_basket, basket
  product_id 44, zero JavaScript, three CTAs
- n8n environment corrected: we do not hand out n8n workspaces; the participant
  uses n8n's own free plan. Body, hero fact, FAQ and JSON-LD say so plainly.
- JSON-LD Course + FAQPage; Plausible snippet; FAQ and Buy markings

workshops/index.html
- hub page, two cards (masterclass USD 120.00 / bootcamp USD 465.00), pull quote,
  routing section, FAQ, comparison table
- the bootcamp card carries no term or date; the "ERP Automation Quick Wins" free
  offer is gone entirely (no card, no 1-hour format, no /free-webinar link)
- JSON-LD ItemList; Plausible snippet; FAQ markings

SEO: canonical to the slash URL, OG tags, the bootcamp's font/style.css loading
pattern, sitemap.xml (+2 urls, lastmod 2026-10-28, bootcamp lastmod bumped for the
two links added there), llms.txt (+2 lines). Cross-linked both ways and both to the
bootcamp; the bootcamp page gains the inbound links.

English only. No DE/ES twins yet - translator follow-up.

Checks: verify-html.py 0 problems, check-links.py clean, check-links-2026-10-28.py
56 PASS / 0 FAIL, verify-plausible-events 71 PASS / 0 FAIL, JSON-LD parses.

odoo-erp-automation-bootcamp/index.html

@@ -794,6 +794,8 @@
         </div>
         <ul class="bc-related">
           <li><a href="/support.html#contact">Questions before you book? Talk to us first</a></li>
+          <li><a href="/workshops/">All our live courses, side by side</a></li>
+          <li><a href="/odoo-n8n-masterclass/">The two-hour masterclass on calling n8n from Odoo</a></li>
           <li><a href="/odoo-hosting-2027.html">What hosting looks like after your year with us</a></li>
           <li><a href="/support.html">What our support does and does not cover</a></li>
           <li><a href="/blog/posts/community-vs-enterprise-cost.html">What Community costs compared with Enterprise</a></li>