Bot pages: expose them in the footer under a "For bots" column

Previously /llms.txt and /links-for-bots/ existed but were not linked anywhere,
so users/bots couldn't find them. Following Proxify's pattern, add a "For bots"
footer column (all 225 pages, EN/MK/SI) linking to category link lists and an
AI summary page.

build_botlinks.py now also generates:
  /links-for-bots/blog|guide|projects/   per-section link lists (EN/MK/SI)
  /links-for-bots/about-msos/            "Hey AI, learn about us" summary
  /links-for-bots/  hub  +  /llms.txt

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

en/student-welcome-guide/index.html

@@ -496,6 +496,13 @@
                     <a href="../../en/timeline-and-milestones/">Timeline and milestones</a>
                     <a href="mailto:info@msosorg.com">Contact us</a>
                     </div>
+                            <div class="links-column">
+                    <h4>For bots</h4>
+                    <a href="/links-for-bots/blog/">Blog articles</a>
+                    <a href="/links-for-bots/guide/">Student guide</a>
+                    <a href="/links-for-bots/projects/">Events &amp; projects</a>
+                    <a href="/links-for-bots/about-msos/">Hey AI, learn about us</a>
+                </div>
             </div>
         </div>
         <hr>