fix: store menu 404, logger crash, platform detection, and sidebar UX

- Fix store menu API URL (/store/menu/render/store, not /store/core/...)
- Fix storeLog/merchantLog fallback to console object instead of console.log
- Embed platform_id/platform_code in store JWT from URL context at login
- Use token_platform_id in store menu endpoint with DB fallback for old tokens
- Add "Menu unavailable" warning in sidebar fallback for all three frontends
- Standardize admin section default to all-open (consistent with store/merchant)

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

app/templates/store/partials/sidebar.html

@@ -86,7 +86,7 @@
         </template>
     </div>
 
-    <!-- Fallback: static dashboard link (if menu API fails) -->
+    <!-- Fallback: static dashboard link + warning (if menu API fails) -->
     <div x-show="!menuLoading && !menuData" x-cloak>
         <ul class="mt-6">
             <li class="relative px-6 py-3">
@@ -99,6 +99,11 @@
                 </a>
             </li>
         </ul>
+        <div class="px-6 mt-4">
+            <p class="text-xs text-gray-400 dark:text-gray-500">
+                Menu unavailable. Showing default items only.
+            </p>
+        </div>
     </div>
 
     <!-- Quick Actions (static, outside dynamic menu) -->