Add Android APK download feature

- Create android/ directory with Kotlin + Jetpack Compose project
- Build APK at public/sysadmin.apk
- Add sidebar nav item and dashboard stat card to download APK
- Add android/ to .gitignore

.gitignore

@@ -3,3 +3,4 @@
 .idea/
 logs/
 *.log
+android/

views/dashboard/index.php

@@ -52,6 +52,13 @@ $recentActivity = $recentActivity ?? [];
             <span class="stat-label">Avg Disk</span>
         </div>
     </div>
+    <a href="/sysadmin.apk" class="stat-card stat-card-info" download style="text-decoration:none; cursor:pointer;">
+        <div class="stat-icon"><i class="fas fa-download"></i></div>
+        <div class="stat-info">
+            <span class="stat-value">v1.0</span>
+            <span class="stat-label">Android App</span>
+        </div>
+    </a>
 </div>
 
 <div class="dashboard-grid">

views/layouts/main.php

@@ -76,6 +76,14 @@
                         </a>
                     </li>
                     <?php endif; ?>
+                    <li class="nav-divider"></li>
+                    <li class="nav-section">Mobile</li>
+                    <li class="nav-item">
+                        <a href="/sysadmin.apk" class="nav-link" download>
+                            <i class="fas fa-download"></i>
+                            <span>Download APK</span>
+                        </a>
+                    </li>
                 </ul>
             </nav>
             <div class="sidebar-footer">