feat: complete dynamic menu system across all frontends

- Add "Merchant Frontend" tab to admin menu-config page
- Merchant render endpoint now respects AdminMenuConfig visibility
  via get_merchant_primary_platform_id() platform resolution
- New store menu render endpoint (GET /store/core/menu/render/store)
  with platform-scoped visibility and store_code interpolation
- Store sidebar migrated from hardcoded Jinja2 macros to dynamic
  Alpine.js x-for rendering with loading skeleton and fallback
- Store init-alpine.js: add loadMenuConfig(), expandSectionForCurrentPage()
- Include store page route fixes, login template updates, and tests

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

app/modules/tenancy/templates/tenancy/admin/platform-menu-config.html

@@ -20,7 +20,7 @@
         <div>
             <h2 class="text-lg font-semibold text-gray-700 dark:text-gray-200" x-text="platform?.name || 'Loading...'"></h2>
             <p class="text-sm text-gray-500 dark:text-gray-400">
-                Configure which menu items are visible for admins and stores on this platform.
+                Configure which menu items are visible for admins, stores, and merchants on this platform.
             </p>
         </div>
         <span class="px-3 py-1 text-sm font-medium rounded-full bg-purple-100 text-purple-800 dark:bg-purple-900 dark:text-purple-200" x-text="platform?.code?.toUpperCase()"></span>
@@ -52,6 +52,17 @@
             <span x-html="$icon('shopping-bag', 'w-4 h-4 inline mr-2')"></span>
             Store Frontend
         </button>
+        <button
+            @click="frontendType = 'merchant'; loadPlatformMenuConfig()"
+            :class="{
+                'bg-white dark:bg-gray-800 shadow': frontendType === 'merchant',
+                'text-gray-600 dark:text-gray-400': frontendType !== 'merchant'
+            }"
+            class="px-4 py-2 text-sm font-medium rounded-md transition-all"
+        >
+            <span x-html="$icon('lightning-bolt', 'w-4 h-4 inline mr-2')"></span>
+            Merchant Frontend
+        </button>
     </div>
 </div>
 

app/modules/tenancy/templates/tenancy/store/login.html

@@ -181,10 +181,24 @@
     <!-- 4. API Client -->
     <script defer src="{{ url_for('static', path='shared/js/api-client.js') }}"></script>
 
-    <!-- 5. Alpine.js v3 -->
-    <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.14.0/dist/cdn.min.js"></script>
+    <!-- 5. Alpine.js v3 with CDN fallback -->
+    <script>
+    (function() {
+        var script = document.createElement('script');
+        script.defer = true;
+        script.src = 'https://cdn.jsdelivr.net/npm/alpinejs@3.14.0/dist/cdn.min.js';
+        script.onerror = function() {
+            console.warn('Alpine.js CDN failed, loading local copy...');
+            var fallbackScript = document.createElement('script');
+            fallbackScript.defer = true;
+            fallbackScript.src = '{{ url_for("static", path="shared/js/lib/alpine.min.js") }}';
+            document.head.appendChild(fallbackScript);
+        };
+        document.head.appendChild(script);
+    })();
+    </script>
 
-    <!-- 6. Login Logic -->
+    <!-- 6. Store Login Logic -->
     <script defer src="{{ url_for('tenancy_static', path='store/js/login.js') }}"></script>
 </body>
 </html>