Add cross-repo navigation footer with links to all 8 CANS Lab tools

Footer now shows links to all sibling repos (EpiRank, MV17, CASMIM,
HETA, HATA, BCAT, SRAC-Agent, AED2) with current repo highlighted.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: canslab1

index.html

@@ -451,6 +451,23 @@ <h2 id="license">License</h2>
         </article>
     </main>
     <footer class="site-footer" role="contentinfo">
+        <nav class="footer-nav" aria-label="CANS Lab Software">
+            <a href="https://canslab1.github.io/EpiRank/">EpiRank</a>
+            <span class="footer-sep">&middot;</span>
+            <a href="https://canslab1.github.io/MV17/">MV17</a>
+            <span class="footer-sep">&middot;</span>
+            <a href="https://canslab1.github.io/CASMIM/">CASMIM</a>
+            <span class="footer-sep">&middot;</span>
+            <a href="https://canslab1.github.io/HETA/">HETA</a>
+            <span class="footer-sep">&middot;</span>
+            <span class="current">HATA</span>
+            <span class="footer-sep">&middot;</span>
+            <a href="https://canslab1.github.io/BCAT/">BCAT</a>
+            <span class="footer-sep">&middot;</span>
+            <a href="https://canslab1.github.io/SRAC-Agent/">SRAC-Agent</a>
+            <span class="footer-sep">&middot;</span>
+            <a href="https://canslab1.github.io/AED2/">AED2</a>
+        </nav>
         <p>&copy; CANS Lab, Chang Gung University &middot;
            <a href="https://canslab1.github.io/">canslab1.github.io</a></p>
     </footer>