feat: integrate contextual links and fix coupons navigation

- Added DocLink component and mapped routes
- Fixed Coupons nav link to /marketing/coupons
- Updated Settings pages to show inline documentation links

includes/Compat/NavigationRegistry.php

@@ -15,7 +15,7 @@ if (! defined('ABSPATH')) exit;
 class NavigationRegistry
 {
     const NAV_OPTION = 'wnw_nav_tree';
-    const NAV_VERSION = '1.3.0'; // Added Subscriptions section
+    const NAV_VERSION = '1.3.1'; // Updated Coupons link
 
     /**
      * Initialize hooks
@@ -222,7 +222,7 @@ class NavigationRegistry
         }
 
         // Coupons - always available
-        $children[] = ['label' => __('Coupons', 'woonoow'), 'mode' => 'spa', 'path' => '/coupons'];
+        $children[] = ['label' => __('Coupons', 'woonoow'), 'mode' => 'spa', 'path' => '/marketing/coupons'];
 
         return $children;
     }