feat: route commands for peer clients (Linux/Windows) + footer signature

- scripts page: new card with Linux/macOS and Windows route commands
  per peer that has advertised_routes, with OS tab switcher and copy buttons
- Made by Galyaviev moved from sidebar to bottom-center page footer on all pages
- page-footer style: Dancing Script 20px, clickable mailto:ruslan@ipcom.su

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gui/templates/base.html

@@ -32,7 +32,6 @@
         <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"/><polyline points="16 17 21 12 16 7"/><line x1="21" y1="12" x2="9" y2="12"/></svg>
         Выйти
       </a>
-      <div class="made-by"><a href="mailto:ruslan@ipcom.su">Made by Galyaviev</a></div>
     </div>
   </aside>
   <div class="layout">
@@ -49,6 +48,9 @@
       {% endwith %}
       {% block content %}{% endblock %}
     </main>
+    <footer class="page-footer">
+      <a href="mailto:ruslan@ipcom.su">Made by Galyaviev</a>
+    </footer>
   </div>
 </body>
 </html>