Add GitHub link, fix Settings page, direct users to setup on install

Plugin/varaverk.plg:
  - Add support="https://github.com/FailedProxy/Varaverk/issues"
  - Install completion log now says "open Varaverk to complete setup"
    with navigation hint — user lands on wizard automatically

Plugin/unraid/VaraverkSettings.page:
  - Fix stale SCRIPTS_DIR default (unraid_scripts → Varaverk)
  - Add GitHub / Issues / Changelog links at bottom of settings page

Plugin/unraid/Varaverk.page:
  - Small "⎋ GitHub" link right-aligned in the tab bar
    links to github.com/FailedProxy/Varaverk in a new tab

Plugin/unraid/Varaverk.page

@@ -40,6 +40,12 @@ $tabLabels = ['monitor' => 'Monitor', 'scheduler' => 'Scheduler', 'docker' => 'D
         <?= $tabLabels[$t] ?? ucfirst($t) ?>
       </a>
     <?php endforeach; ?>
+    <a href="https://github.com/FailedProxy/Varaverk" target="_blank"
+       style="margin-left:auto;padding:0 10px;font-size:10px;color:#333;text-decoration:none;
+              display:flex;align-items:center;letter-spacing:.03em;"
+       title="GitHub — source, issues, changelog">
+      ⎋ GitHub
+    </a>
   </div>
 
   <!-- Tab content -->