feat: add Admin UI for platform module management (Phase 5)

Added a complete Admin UI for managing platform modules:

API endpoints (app/api/v1/admin/modules.py):
- GET /modules - List all available modules
- GET /modules/platforms/{id} - Get platform modules
- PUT /modules/platforms/{id} - Update enabled modules
- POST /modules/platforms/{id}/enable - Enable a module
- POST /modules/platforms/{id}/disable - Disable a module
- POST /modules/platforms/{id}/enable-all - Enable all
- POST /modules/platforms/{id}/disable-optional - Core only

Admin UI:
- New page route: /admin/platforms/{code}/modules
- Template: platform-modules.html
- JavaScript: platform-modules.js
- Link added to platform-detail.html Super Admin section

Features:
- Toggle modules on/off with dependency resolution
- Enable all / Core only bulk actions
- Visual dependency indicators
- Separate sections for core vs optional modules
- Feature list preview per module

Also includes require_menu_access updates to page routes from Phase 2.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/templates/admin/platform-detail.html

@@ -90,6 +90,37 @@
         </div>
     </div>
 
+    <!-- Super Admin Actions (Menu Configuration) -->
+    <div x-show="isSuperAdmin" class="bg-white dark:bg-gray-800 rounded-lg shadow-md p-6">
+        <h3 class="text-lg font-semibold text-gray-900 dark:text-white mb-4">
+            <span class="inline-flex items-center">
+                Super Admin
+                <span class="ml-2 px-2 py-0.5 text-xs font-medium rounded bg-purple-100 text-purple-800 dark:bg-purple-900 dark:text-purple-200">Admin Only</span>
+            </span>
+        </h3>
+        <div class="grid grid-cols-1 md:grid-cols-4 gap-4">
+            <!-- Module Configuration -->
+            <a :href="`/admin/platforms/${platformCode}/modules`"
+               class="flex items-center p-4 bg-green-50 dark:bg-green-900/20 rounded-lg hover:bg-green-100 dark:hover:bg-green-900/40 transition-colors">
+                <span x-html="$icon('puzzle', 'w-8 h-8 text-green-600 dark:text-green-400')"></span>
+                <div class="ml-3">
+                    <p class="font-semibold text-gray-900 dark:text-white">Module Configuration</p>
+                    <p class="text-sm text-gray-600 dark:text-gray-400">Enable/disable features</p>
+                </div>
+            </a>
+
+            <!-- Menu Configuration -->
+            <a :href="`/admin/platforms/${platformCode}/menu-config`"
+               class="flex items-center p-4 bg-amber-50 dark:bg-amber-900/20 rounded-lg hover:bg-amber-100 dark:hover:bg-amber-900/40 transition-colors">
+                <span x-html="$icon('view-grid', 'w-8 h-8 text-amber-600 dark:text-amber-400')"></span>
+                <div class="ml-3">
+                    <p class="font-semibold text-gray-900 dark:text-white">Menu Configuration</p>
+                    <p class="text-sm text-gray-600 dark:text-gray-400">Admin & vendor menus</p>
+                </div>
+            </a>
+        </div>
+    </div>
+
     <!-- Stats Grid -->
     <div class="grid grid-cols-1 md:grid-cols-4 gap-6">
         <!-- Vendors -->