Refactor API client and stock management logic for improved clarity, error handling, and support for additional stock types.

src/features/auth/settings-page.js

@@ -18,7 +18,10 @@ export function renderSettingsPage() {
               <form class="vstack gap-3" @submit.prevent="save()">
                 <div>
                   <label class="form-label">Tryton server URL</label>
-                  <input class="form-control" type="url" x-model="form.baseUrl" required />
+                  <input class="form-control" type="url" x-model="form.baseUrl" />
+                  <div class="form-text">
+                    Leave empty to use the same origin as this deployed Lonc frontend.
+                  </div>
                 </div>
                 <div>
                   <label class="form-label">Database name</label>
@@ -36,6 +39,7 @@ export function renderSettingsPage() {
               <h2 class="h5">Integration notes</h2>
               <ul class="text-body-secondary small ps-3 mb-0">
                 <li>Connection uses Tryton user application keys for the <code>kitchen</code> application.</li>
+                <li>Leaving the server URL empty makes API calls use same-origin relative paths.</li>
                 <li>Kitchen-scoped requests are built as <code>/{database}/kitchen/{kitchenId}/...</code>.</li>
                 <li>Label preview accepts image blobs, image URLs, or SVG payloads.</li>
               </ul>