fix: define global toast utility in app-init

- Added window.toast() in app-init.js so workshop/customers/inventory pages can use it.

- Bumped app-init.js cache version on all templates.

pos/templates/fleet.html

@@ -303,7 +303,7 @@
 </div>
 
 <script src="/pos/static/js/i18n.js?v=36" defer></script>
-<script src="/pos/static/js/app-init.js" defer></script>
+<script src="/pos/static/js/app-init.js?v=2" defer></script>
 <script src="/pos/static/js/splash-loader.js?v=33" defer></script>
 <script src="/pos/static/js/pos-utils.js?v=33" defer></script>
   <script src="/pos/static/js/sidebar.js?v=36" defer></script>