feat(dashboard): add Server Links page with all service URLs

Categorized link cards for all services across nodes + public domains.
Opens in new tabs. Accessible from sidebar navigation.

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

server/static/index.html

@@ -25,6 +25,9 @@
         <a href="#" class="sidebar-item active" id="nav-all" data-view="all">
             <span class="sidebar-icon">&#9776;</span> All Services
         </a>
+        <a href="#" class="sidebar-item" id="nav-links" data-view="links">
+            <span class="sidebar-icon">&#128279;</span> Server Links
+        </a>
     </div>
 
     <div class="sidebar-section">
@@ -72,6 +75,9 @@
         <span class="empty-icon">&#128230;</span>
         <p>No services found</p>
     </div>
+
+    <!-- Links view -->
+    <div id="links-view" style="display:none;"></div>
 </main>
 
 <!-- ===== Log Viewer (slide-out panel) ===== -->