Add site footer and fix proxy-aware viewer URLs.

Build public links from host_url netloc behind reverse proxies so generated viewer URLs do not include the internal upstream port.

Co-authored-by: Cursor <cursoragent@cursor.com>

templates/_footer.html

@@ -0,0 +1,3 @@
+<footer class="site-footer">
+  <p>© 2026 <a href="https://dashy.elpatron.me" target="_blank" rel="noopener noreferrer">KnorrLabs</a> – <a href="https://gitea.elpatron.me/elpatron/Idle-Fantasy-Save-Viewer" target="_blank" rel="noopener noreferrer">Source Code</a></p>
+</footer>

templates/index.html

@@ -73,5 +73,6 @@
       <section class="tab-panel" id="tab-history"></section>
     </main>
   </div>
+  {% include '_footer.html' %}
 </body>
 </html>

templates/landing.html

@@ -52,5 +52,6 @@
       </select>
     </label>
   </main>
+  {% include '_footer.html' %}
 </body>
 </html>