fix(routing): fix store login 404 caused by CMS catch-all route priority

The CMS catch-all route /{store_code}/{slug} was registered before tenancy's
/{store_code}/login because modules are discovered alphabetically (cms before
tenancy). Also fix login.js store code extraction for /platforms/{code}/store/...
URL pattern.

- Add ROUTE_CONFIG priority=100 to CMS store pages so catch-all registers last
- Sort get_store_page_routes() by priority (matching other route getters)
- Use indexOf('store') in login.js to support platform-prefixed URLs

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

app/modules/tenancy/static/store/js/login.js

@@ -39,9 +39,11 @@ function storeLogin() {
                 storeLoginLog.debug('Dark mode:', this.dark);
 
                 // Get store code from URL path
+                // Supports both /store/{code}/login and /platforms/{platform}/store/{code}/login
                 const pathSegments = window.location.pathname.split('/').filter(Boolean);
-                if (pathSegments[0] === 'store' && pathSegments[1]) {
-                    this.storeCode = pathSegments[1];
+                const storeIndex = pathSegments.indexOf('store');
+                if (storeIndex !== -1 && pathSegments[storeIndex + 1]) {
+                    this.storeCode = pathSegments[storeIndex + 1];
                     storeLoginLog.debug('Store code from URL:', this.storeCode);
                     await this.loadStore();
                 }