feat(seo): add /what-can-i-use-odoo-for/ guide page, linked from the homepage and support FAQ

Modelled on odoo-community-upgrade.html (top bar, band rhythm, FAQ details).
Copy published verbatim from the copywriter's 2026-10-28 file: 58-char title,
157-char meta, the six outbound internal links and the WebPage+Article+FAQPage+
BreadcrumbList @graph. Nine FAQ questions marked plausible-event-name=FAQ (no
event fires on page load). Sitemap + llms.txt list the new URL. Inbound links:
one from the homepage FAQ card, one from the support FAQ answer. Nothing else
moves; no footer change.

llms.txt

@@ -36,6 +36,7 @@
 - [Odoo ERP Automation Bootcamp](https://odoo4projects.com/odoo-erp-automation-bootcamp/): a three-month, ten-session live bootcamp with Oliver Arnold, Technical Lead, that takes a small business from zero to a running ERP. Thursdays, one hour, Q1 2026, starting 8 January 2026; one year of hosted Odoo Community Edition included. The current price is confirmed on registration.
 - [ODOO x N8N Masterclass](https://odoo4projects.com/odoo-n8n-masterclass/): a two-hour live masterclass with Oliver Arnold on connecting Odoo to n8n — calling n8n webhooks from Odoo automated actions, how the n8n integration for Odoo works, and website workarounds that extend your automation. Hands-on in a free Odoo trial system; n8n itself runs on n8n's own free plan, which is not included. USD 120.00, next session the four Thursdays of February 2027 at 17:00 Central Time.
 - [ODOO Workshops and Classes](https://odoo4projects.com/workshops/): the two live courses side by side — the two-hour ODOO x N8N Masterclass (USD 120.00) and the ten-session ODOO ERP Automation Bootcamp (USD 465.00), both taught by Oliver Arnold — which course fits which business, and a full comparison table.
+- [What can I use Odoo for?](https://odoo4projects.com/what-can-i-use-odoo-for/): plain-English guide to what Odoo is used for — the ten apps and what each is for, what Odoo is used for by business type (manufacturing, retail and trade, services, construction, nonprofits, accounting practices, small business starting out), where it stops (Odoo Online will not take custom code, it will not do your trade's specialist work), what it costs, and how to start. Includes the nine-question FAQ.
 - [A briefing for Andrew](https://odoo4projects.com/odooityourself.html): Odoo Community as a first-class citizen — the vision behind our managed Community hosting, the six regions, the management console, the MCP agent that can touch the server, and the plan prices (Empire quoted per setup).
 - [Home](https://odoo4projects.com/): plans and pricing, FAQ, server locations.
 - [Support](https://odoo4projects.com/support.html): support and frequently asked questions.